diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9074f0e
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,72 @@
+# 学生成绩管理系统 Makefile
+# 编译器设置
+CC = gcc
+CFLAGS = -Wall -Wextra -std=c99 -g
+
+# 目标文件
+TARGET = student_system
+
+# 源文件
+SOURCES = main.c globals.c auxiliary.c main_menu.c user_manage.c stu_data.c statistical_analysis.c
+
+# 目标文件
+OBJECTS = $(SOURCES:.c=.o)
+
+# 头文件
+HEADERS = config.h globals.h auxiliary.h main_menu.h user_manage.h stu.data.h statistical_analysis.h
+
+# 默认目标
+all: $(TARGET)
+
+# 链接目标文件
+$(TARGET): $(OBJECTS)
+	$(CC) $(OBJECTS) -o $(TARGET)
+
+# 编译源文件
+%.o: %.c $(HEADERS)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+# 清理编译文件
+clean:
+	rm -f $(OBJECTS) $(TARGET)
+	rm -f *.exe
+
+# 创建必要的目录
+setup:
+	mkdir -p data
+	mkdir -p backup
+
+# 运行程序
+run: $(TARGET)
+	./$(TARGET)
+
+# Windows 特定目标
+windows: CFLAGS += -DWINDOWS
+windows: $(TARGET)
+
+# 调试版本
+debug: CFLAGS += -DDEBUG -O0
+debug: $(TARGET)
+
+# 发布版本
+release: CFLAGS += -O2 -DNDEBUG
+release: $(TARGET)
+
+# 安装（可选）
+install: $(TARGET)
+	cp $(TARGET) /usr/local/bin/
+
+# 帮助信息
+help:
+	@echo "可用的目标："
+	@echo "  all      - 编译程序（默认）"
+	@echo "  clean    - 清理编译文件"
+	@echo "  setup    - 创建必要的目录"
+	@echo "  run      - 编译并运行程序"
+	@echo "  windows  - 编译Windows版本"
+	@echo "  debug    - 编译调试版本"
+	@echo "  release  - 编译发布版本"
+	@echo "  install  - 安装程序到系统"
+	@echo "  help     - 显示此帮助信息"
+
+.PHONY: all clean setup run windows debug release install help
\ No newline at end of file
diff --git a/auxiliary.c b/auxiliary.c
new file mode 100644
index 0000000..9166e3f
--- /dev/null
+++ b/auxiliary.c
@@ -0,0 +1,449 @@
+/**
+ * @file auxiliary.c
+ * @brief 辅助函数实现文件
+ * @note 实现系统中使用的各种辅助函数
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <errno.h>
+#ifdef _WIN32
+#include <windows.h>
+#include <direct.h>
+#include <conio.h>
+#else
+#include <sys/stat.h>
+#include <unistd.h>
+#include <termios.h>
+#endif
+
+#include "auxiliary.h"
+#include "config.h"
+#include "globals.h"
+#include "stu.data.h"
+#include "user_manage.h"
+
+/**
+ * @brief 清理输入缓冲区
+ */
+void clearInputBuffer()
+{
+    int c;
+    while ((c = getchar()) != '\n' && c != EOF)
+        ;
+}
+
+/**
+ * @brief 暂停系统，等待用户按键
+ */
+void pauseSystem()
+{
+    printf("\n按任意键继续...");
+#ifdef _WIN32
+    _getch();
+#else
+    getchar();
+#endif
+    printf("\n");
+}
+
+/**
+ * @brief 清屏
+ */
+void clearScreen()
+{
+#ifdef _WIN32
+    system("cls");
+#else
+    system("clear");
+#endif
+}
+
+/**
+ * @brief 打印分隔线
+ */
+void printSeparator()
+{
+    printf("========================================\n");
+}
+
+/**
+ * @brief 打印标题头
+ * @param title 标题文本
+ */
+void printHeader(const char *title)
+{
+    printSeparator();
+    printf("          %s\n", title);
+    printSeparator();
+}
+
+/**
+ * @brief 验证分数是否合法
+ * @param score 分数
+ * @return 合法返回true，否则返回false
+ */
+bool isValidScore(float score)
+{
+    return score >= MIN_SCORE && score <= MAX_SCORE;
+}
+
+/**
+ * @brief 验证学号格式
+ * @param id 学号
+ * @return 合法返回true，否则返回false
+ */
+bool isValidStudentID(const char *id)
+{
+    if (id == NULL || strlen(id) == 0 || strlen(id) >= MAX_ID_LENGTH)
+    {
+        return false;
+    }
+
+    // 检查是否只包含数字和字母
+    for (int i = 0; id[i] != '\0'; i++)
+    {
+        if (!isalnum(id[i]))
+        {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+/**
+ * @brief 验证姓名格式
+ * @param name 姓名
+ * @return 合法返回true，否则返回false
+ */
+bool isValidName(const char *name)
+{
+    if (name == NULL || strlen(name) == 0 || strlen(name) >= MAX_NAME_LENGTH)
+    {
+        return false;
+    }
+
+    // 检查是否包含非法字符
+    for (int i = 0; name[i] != '\0'; i++)
+    {
+        if (!isalpha(name[i]) && name[i] != ' ' && name[i] != '-' &&
+            (unsigned char)name[i] < 128)
+        { // 允许中文字符
+            return false;
+        }
+    }
+
+    return true;
+}
+
+/**
+ * @brief 验证性别
+ * @param gender 性别字符
+ * @return 合法返回true，否则返回false
+ */
+bool isValidGender(char gender)
+{
+    return gender == GENDER_MALE || gender == GENDER_FEMALE;
+}
+
+/**
+ * @brief 验证年龄
+ * @param age 年龄
+ * @return 合法返回true，否则返回false
+ */
+bool isValidAge(int age)
+{
+    return age >= 10 && age <= 100;
+}
+
+/**
+ * @brief 去除字符串首尾空格
+ * @param str 字符串
+ */
+void trimString(char *str)
+{
+    if (str == NULL)
+        return;
+
+    // 去除开头空格
+    char *start = str;
+    while (isspace(*start))
+        start++;
+
+    // 去除结尾空格
+    char *end = str + strlen(str) - 1;
+    while (end > start && isspace(*end))
+        end--;
+
+    // 移动字符串
+    int len = end - start + 1;
+    memmove(str, start, len);
+    str[len] = '\0';
+}
+
+/**
+ * @brief 判断字符串是否为空
+ * @param str 字符串
+ * @return 为空返回true，否则返回false
+ */
+bool isEmptyString(const char *str)
+{
+    if (str == NULL)
+        return true;
+
+    while (*str)
+    {
+        if (!isspace(*str))
+            return false;
+        str++;
+    }
+    return true;
+}
+
+/**
+ * @brief 检查文件是否存在
+ * @param filename 文件名
+ * @return 存在返回true，否则返回false
+ */
+bool fileExists(const char *filename)
+{
+    FILE *file = fopen(filename, "r");
+    if (file)
+    {
+        fclose(file);
+        return true;
+    }
+    return false;
+}
+
+/**
+ * @brief 创建目录
+ * @param path 目录路径
+ * @return 成功返回true，否则返回false
+ */
+bool createDirectory(const char *path)
+{
+#ifdef _WIN32
+    return _mkdir(path) == 0 || errno == EEXIST;
+#else
+    return mkdir(path, 0755) == 0 || errno == EEXIST;
+#endif
+}
+
+/**
+ * @brief 计算平均分
+ * @param scores 分数数组
+ * @param count 分数个数
+ * @return 平均分
+ */
+float calculateAverage(float scores[], int count)
+{
+    if (count <= 0)
+        return 0.0;
+
+    float sum = 0.0;
+    for (int i = 0; i < count; i++)
+    {
+        sum += scores[i];
+    }
+    return sum / count;
+}
+
+/**
+ * @brief 安全输入整数
+ * @param prompt 提示信息
+ * @param min 最小值
+ * @param max 最大值
+ * @return 输入的整数
+ */
+int safeInputInt(const char *prompt, int min, int max)
+{
+    int value;
+    char buffer[100];
+
+    while (1)
+    {
+        printf("%s (%d-%d): ", prompt, min, max);
+
+        if (fgets(buffer, sizeof(buffer), stdin) != NULL)
+        {
+            if (sscanf(buffer, "%d", &value) == 1)
+            {
+                if (value >= min && value <= max)
+                {
+                    return value;
+                }
+            }
+        }
+
+        printError("输入无效，请重新输入！");
+    }
+}
+
+/**
+ * @brief 安全输入浮点数
+ * @param prompt 提示信息
+ * @param min 最小值
+ * @param max 最大值
+ * @return 输入的浮点数
+ */
+float safeInputFloat(const char *prompt, float min, float max)
+{
+    float value;
+    char buffer[100];
+
+    while (1)
+    {
+        printf("%s (%.1f-%.1f): ", prompt, min, max);
+
+        if (fgets(buffer, sizeof(buffer), stdin) != NULL)
+        {
+            if (sscanf(buffer, "%f", &value) == 1)
+            {
+                if (value >= min && value <= max)
+                {
+                    return value;
+                }
+            }
+        }
+
+        printError("输入无效，请重新输入！");
+    }
+}
+
+/**
+ * @brief 安全输入字符串
+ * @param prompt 提示信息
+ * @param buffer 缓冲区
+ * @param maxLen 最大长度
+ */
+void safeInputString(const char *prompt, char *buffer, int maxLen)
+{
+    while (1)
+    {
+        printf("%s: ", prompt);
+
+        if (fgets(buffer, maxLen, stdin) != NULL)
+        {
+            // 移除换行符
+            buffer[strcspn(buffer, "\n")] = '\0';
+            trimString(buffer);
+
+            if (!isEmptyString(buffer))
+            {
+                return;
+            }
+        }
+
+        printError("输入不能为空，请重新输入！");
+    }
+}
+
+/**
+ * @brief 彩色输出
+ * @param text 文本
+ * @param color 颜色代码
+ */
+void printColored(const char *text, const char *color)
+{
+    printf("%s%s%s", color, text, COLOR_RESET);
+}
+
+/**
+ * @brief 成功消息
+ * @param message 消息
+ */
+void printSuccess(const char *message)
+{
+    printColored(message, COLOR_GREEN);
+    printf("\n");
+}
+
+/**
+ * @brief 错误消息
+ * @param message 消息
+ */
+void printError(const char *message)
+{
+    printColored(message, COLOR_RED);
+    printf("\n");
+}
+
+/**
+ * @brief 警告消息
+ * @param message 消息
+ */
+void printWarning(const char *message)
+{
+    printColored(message, COLOR_YELLOW);
+    printf("\n");
+}
+
+/**
+ * @brief 信息消息
+ * @param message 消息
+ */
+void printInfo(const char *message)
+{
+    printColored(message, COLOR_CYAN);
+    printf("\n");
+}
+
+/**
+ * @brief 初始化系统
+ * @return 成功返回true，否则返回false
+ */
+bool initializeSystem()
+{
+    // 创建数据目录
+    if (!createDataDirectories())
+    {
+        return false;
+    }
+
+    // 加载用户数据
+    loadUsersFromFile();
+
+    // 加载学生数据
+    loadStudentsFromFile();
+
+    systemInitialized = true;
+    return true;
+}
+
+/**
+ * @brief 创建数据目录
+ * @return 成功返回true，否则返回false
+ */
+bool createDataDirectories()
+{
+    if (!createDirectory("data"))
+    {
+        return false;
+    }
+
+    if (!createDirectory(BACKUP_DIR))
+    {
+        return false;
+    }
+
+    return true;
+}
+
+/**
+ * @brief 清理系统资源
+ */
+void cleanupSystem()
+{
+    // 保存数据
+    if (dataModified)
+    {
+        saveStudentsToFile();
+        saveUsersToFile();
+    }
+
+    systemInitialized = false;
+}
\ No newline at end of file
diff --git a/auxiliary.h b/auxiliary.h
new file mode 100644
index 0000000..2a2e5cf
--- /dev/null
+++ b/auxiliary.h
@@ -0,0 +1,62 @@
+/**
+ * @file auxiliary.h
+ * @brief 辅助函数头文件
+ * @note 包含系统中使用的各种辅助函数声明
+ */
+
+#ifndef AUXILIARY_H
+#define AUXILIARY_H
+
+#include <stdbool.h>
+#include "main_menu.h"
+
+// 输入输出辅助函数
+void clearInputBuffer();                    // 清理输入缓冲区
+void pauseSystem();                         // 暂停系统，等待用户按键
+void clearScreen();                         // 清屏
+void printSeparator();                      // 打印分隔线
+void printHeader(const char* title);       // 打印标题头
+
+// 数据验证函数
+bool isValidScore(float score);             // 验证分数是否合法 (0-100)
+bool isValidStudentID(const char* id);      // 验证学号格式
+bool isValidName(const char* name);         // 验证姓名格式
+bool isValidGender(char gender);            // 验证性别
+bool isValidAge(int age);                   // 验证年龄
+
+// 字符串处理函数
+void trimString(char* str);                 // 去除字符串首尾空格
+bool isEmptyString(const char* str);        // 判断字符串是否为空
+void toLowerCase(char* str);                // 转换为小写
+void toUpperCase(char* str);                // 转换为大写
+
+// 文件操作辅助函数
+bool fileExists(const char* filename);      // 检查文件是否存在
+bool createDirectory(const char* path);     // 创建目录
+bool backupFile(const char* source, const char* backup); // 备份文件
+
+// 数学计算辅助函数
+float calculateAverage(float scores[], int count);       // 计算平均分
+float findMaxScore(float scores[], int count);           // 找最高分
+float findMinScore(float scores[], int count);           // 找最低分
+
+
+// 安全输入函数
+int safeInputInt(const char* prompt, int min, int max);  // 安全输入整数
+float safeInputFloat(const char* prompt, float min, float max); // 安全输入浮点数
+void safeInputString(const char* prompt, char* buffer, int maxLen); // 安全输入字符串
+char safeInputChar(const char* prompt, const char* validChars);     // 安全输入字符
+
+// 系统初始化和清理函数
+bool initializeSystem();                   // 初始化系统
+void cleanupSystem();                      // 清理系统资源
+bool createDataDirectories();              // 创建数据目录
+
+// 颜色输出函数
+void printColored(const char* text, const char* color);  // 彩色输出
+void printSuccess(const char* message);    // 成功消息
+void printError(const char* message);      // 错误消息
+void printWarning(const char* message);    // 警告消息
+void printInfo(const char* message);       // 信息消息
+
+#endif // AUXILIARY_H
\ No newline at end of file
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..d9036d5
--- /dev/null
+++ b/config.h
@@ -0,0 +1,108 @@
+/**
+ * @file config.h
+ * @brief 学生成绩管理系统参数配置头文件
+ * @note 本文件集中定义了学生成绩管理系统的所有参数配置，便于统一管理和修改
+ */
+
+#ifndef CONFIG_H
+#define CONFIG_H
+
+// 系统配置参数
+#define MAX_STUDENTS 1000           // 最大学生数量
+#define MAX_COURSES 10              // 每个学生最多课程数
+#define MAX_USERS 50                // 最大用户数量
+#define MAX_LOGIN_ATTEMPTS 3        // 最大登录尝试次数
+
+// 字符串长度限制
+#define MAX_ID_LENGTH 20            // 学号最大长度
+#define MAX_NAME_LENGTH 50          // 姓名最大长度
+#define MAX_COURSE_NAME_LENGTH 50   // 课程名称最大长度
+#define MAX_USERNAME_LENGTH 30      // 用户名最大长度
+#define MAX_PASSWORD_LENGTH 30      // 密码最大长度
+
+// 分数相关配置
+#define MIN_SCORE 0.0               // 最低分数
+#define MAX_SCORE 100.0             // 最高分数
+#define PASS_SCORE 60.0             // 及格分数
+#define EXCELLENT_SCORE 90.0        // 优秀分数
+
+// 文件路径配置
+#define STUDENTS_FILE "data/students.csv"   // 学生数据文件
+#define USERS_FILE "data/users.txt"         // 用户数据文件
+#define BACKUP_DIR "backup/"                // 备份目录
+
+// 菜单选项定义
+#define MENU_EXIT 0
+#define MENU_BASIC_FUNCTIONS 1
+#define MENU_STATISTICS 2
+#define MENU_ADMIN 3
+
+// 基本功能菜单选项
+#define BASIC_BACK 0
+#define BASIC_ADD_STUDENT 1
+#define BASIC_DELETE_STUDENT 2
+#define BASIC_MODIFY_STUDENT 3
+#define BASIC_SEARCH_BY_ID 4
+#define BASIC_SEARCH_BY_NAME 5
+#define BASIC_DISPLAY_ALL 6
+#define BASIC_SORT_STUDENTS 7
+
+// 统计功能菜单选项
+#define STATS_BACK 0
+#define STATS_COURSE_ANALYSIS 1
+#define STATS_SCORE_DISTRIBUTION 2
+#define STATS_SCORE_RANGES 3
+#define STATS_OVERALL_ANALYSIS 4
+
+// 管理功能菜单选项
+#define ADMIN_BACK 0
+#define ADMIN_ADD_USER 1
+#define ADMIN_DELETE_USER 2
+#define ADMIN_MODIFY_PASSWORD 3
+#define ADMIN_VIEW_USERS 4
+
+// 排序选项
+#define SORT_BY_ID 1
+#define SORT_BY_NAME 2
+#define SORT_BY_TOTAL_SCORE 3
+#define SORT_BY_AVERAGE_SCORE 4
+
+// 排序顺序
+#define SORT_ASCENDING 1
+#define SORT_DESCENDING 2
+
+// 性别定义
+#define GENDER_MALE 'M'
+#define GENDER_FEMALE 'F'
+
+// 颜色代码（用于美化输出）
+#define COLOR_RESET "\033[0m"
+#define COLOR_RED "\033[31m"
+#define COLOR_GREEN "\033[32m"
+#define COLOR_YELLOW "\033[33m"
+#define COLOR_BLUE "\033[34m"
+#define COLOR_MAGENTA "\033[35m"
+#define COLOR_CYAN "\033[36m"
+#define COLOR_WHITE "\033[37m"
+
+// 系统消息
+#define MSG_SUCCESS "操作成功！"
+#define MSG_FAILURE "操作失败！"
+#define MSG_NOT_FOUND "未找到相关记录！"
+#define MSG_INVALID_INPUT "输入无效，请重新输入！"
+#define MSG_FILE_ERROR "文件操作错误！"
+
+// 数据结构定义
+typedef struct {
+    char studentID[MAX_ID_LENGTH];          // 学号
+    char name[MAX_NAME_LENGTH];             // 姓名
+    int age;                                // 年龄
+    char gender;                            // 性别 ('M'/'F')
+    char courses[MAX_COURSES][MAX_COURSE_NAME_LENGTH]; // 课程名称
+    float scores[MAX_COURSES];              // 各科成绩
+    int courseCount;                        // 课程数量
+    float totalScore;                       // 总分
+    float averageScore;                     // 平均分
+} Student;
+
+#endif // CONFIG_H
\ No newline at end of file
diff --git a/core_handlers.c b/core_handlers.c
new file mode 100644
index 0000000..4f4ab5d
--- /dev/null
+++ b/core_handlers.c
@@ -0,0 +1,154 @@
+/**
+ * @file core_handlers.c
+ * @brief 核心处理函数实现文件
+ * @note 实现主要的功能处理函数
+ */
+
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ 
+ #include "core_handlers.h"
+ #include "config.h"
+ #include "globals.h"
+ #include "main_menu.h"
+ #include "user_manage.h"
+ #include "stu.data.h"
+ #include "statistical_analysis.h"
+ #include "auxiliary.h"
+ 
+ /**
+  * @brief 处理基本功能菜单
+  */
+ void handleBasicFunctions()
+ {
+     int choice;
+     do {
+         clearScreen();
+         displayBasicFunctionsMenu();
+         choice = safeInputInt("请选择功能", BASIC_BACK, BASIC_SORT_STUDENTS);
+ 
+         switch (choice) {
+             case BASIC_ADD_STUDENT:
+                 addStudent();
+                 break;
+             case BASIC_DELETE_STUDENT:
+                 deleteStudent();
+                 break;
+             case BASIC_MODIFY_STUDENT:
+                 modifyStudent();
+                 break;
+             case BASIC_SEARCH_BY_ID:
+                 searchStudentByID();
+                 break;
+             case BASIC_SEARCH_BY_NAME:
+                 searchStudentByName();
+                 break;
+             case BASIC_DISPLAY_ALL:
+                 displayAllStudents();
+                 break;
+             case BASIC_SORT_STUDENTS:
+                 handleSortStudents();
+                 break;
+             case BASIC_BACK:
+                 break;
+             default:
+                 printError("无效的选择！");
+                 pauseSystem();
+                 break;
+         }
+     } while (choice != BASIC_BACK);
+ }
+ 
+ /**
+  * @brief 处理统计功能菜单
+  */
+ void handleStatistics() {
+     int choice;
+     do {
+         clearScreen();
+         displayStatisticsMenu();
+         choice = safeInputInt("请选择功能", STATS_BACK, STATS_OVERALL_ANALYSIS);
+ 
+         switch (choice) {
+             case STATS_COURSE_ANALYSIS:
+                 displayCourseStatistics();
+                 break;
+             case STATS_SCORE_DISTRIBUTION:
+                 displayScoreDistribution();
+                 break;
+             case STATS_SCORE_RANGES:
+                 displayStudentRanking();
+                 break;
+             case STATS_OVERALL_ANALYSIS:
+                 displayOverallStatistics();
+                 break;
+             case STATS_BACK:
+                 break;
+             default:
+                 printError("无效的选择！");
+                 pauseSystem();
+                 break;
+         }
+     } while (choice != STATS_BACK);
+ }
+ 
+ /**
+  * @brief 处理管理功能菜单
+  */
+ void handleAdminFunctions() {
+     int choice;
+     do {
+         clearScreen();
+         displayAdminMenu();
+         choice = safeInputInt("请选择功能", ADMIN_BACK, ADMIN_VIEW_USERS);
+ 
+         switch (choice) {
+             case ADMIN_ADD_USER:
+                 addUserAccount();
+                 break;
+             case ADMIN_DELETE_USER:
+                 deleteUserAccount();
+                 break;
+             case ADMIN_MODIFY_PASSWORD:
+                 modifyUserPassword();
+                 break;
+             case ADMIN_VIEW_USERS:
+                 viewAllUsers();
+                 break;
+             case ADMIN_BACK:
+                 break;
+             default:
+                 printError("无效的选择！");
+                 pauseSystem();
+                 break;
+         }
+     } while (choice != ADMIN_BACK);
+ }
+ 
+ /**
+  * @brief 处理学生排序功能
+  */
+ void handleSortStudents() {
+     clearScreen();
+     printHeader("学生排序");
+     
+     printf("排序依据：\n");
+     printf("1. 按学号排序\n");
+     printf("2. 按姓名排序\n");
+     printf("3. 按总分排序\n");
+     printf("4. 按平均分排序\n");
+     
+     int criteria = safeInputInt("请选择排序依据", SORT_BY_ID, SORT_BY_AVERAGE_SCORE);
+     
+     printf("\n排序顺序：\n");
+     printf("1. 升序\n");
+     printf("2. 降序\n");
+     
+     int order = safeInputInt("请选择排序顺序", SORT_ASCENDING, SORT_DESCENDING);
+     
+     sortStudents(criteria, order);
+     
+     printf("\n排序完成！\n");
+     displayAllStudents();
+ }
\ No newline at end of file
diff --git a/core_handlers.h b/core_handlers.h
new file mode 100644
index 0000000..c5e7118
--- /dev/null
+++ b/core_handlers.h
@@ -0,0 +1,18 @@
+/**
+ * @file core_handlers.h
+ * @brief 核心处理函数头文件
+ * @note 包含主要的功能处理函数声明
+ */
+
+#ifndef CORE_HANDLERS_H
+#define CORE_HANDLERS_H
+
+#include "config.h"
+
+// 核心处理函数声明
+void handleBasicFunctions();    // 处理基本功能菜单
+void handleStatistics();        // 处理统计功能菜单
+void handleAdminFunctions();     // 处理管理功能菜单
+void handleSortStudents();       // 处理学生排序功能
+
+#endif // CORE_HANDLERS_H
\ No newline at end of file
diff --git a/globals.c b/globals.c
new file mode 100644
index 0000000..f355d04
--- /dev/null
+++ b/globals.c
@@ -0,0 +1,25 @@
+/**
+ * @file globals.c
+ * @brief 全局变量定义文件
+ * @note 定义所有全局变量的实际存储空间
+ */
+
+#include "globals.h"
+
+// 全局变量定义
+Student students[MAX_STUDENTS];             // 学生数组
+User users[MAX_USERS];                      // 用户数组
+int studentCount = 0;                       // 当前学生数量
+int userCount = 0;                          // 当前用户数量
+char currentUser[MAX_USERNAME_LENGTH] = ""; // 当前登录用户
+bool isCurrentUserAdmin = false;            // 当前用户是否为管理员
+
+// 系统状态变量
+bool systemInitialized = false;            // 系统是否已初始化
+bool dataModified = false;                 // 数据是否已修改
+
+// 统计信息缓存
+float overallAverageScore = 0.0;           // 全体学生平均分
+float highestScore = 0.0;                  // 最高分
+float lowestScore = 100.0;                 // 最低分
+bool statsNeedUpdate = true;               // 统计信息是否需要更新
\ No newline at end of file
diff --git a/globals.h b/globals.h
new file mode 100644
index 0000000..9f36f8f
--- /dev/null
+++ b/globals.h
@@ -0,0 +1,39 @@
+/**
+ * @file globals.h
+ * @brief 全局变量声明头文件
+ * @note 集中管理所有全局变量的声明，提高代码可维护性
+ */
+
+#ifndef GLOBALS_H
+#define GLOBALS_H
+
+#include <stdbool.h>
+#include "config.h"
+#include "main_menu.h"
+
+// 用户结构体定义
+typedef struct {
+    char username[MAX_USERNAME_LENGTH];
+    char password[MAX_PASSWORD_LENGTH];
+    bool isAdmin;  // 是否为管理员
+} User;
+
+// 全局变量声明
+extern Student students[MAX_STUDENTS];      // 学生数组
+extern User users[MAX_USERS];               // 用户数组
+extern int studentCount;                    // 当前学生数量
+extern int userCount;                       // 当前用户数量
+extern char currentUser[MAX_USERNAME_LENGTH]; // 当前登录用户
+extern bool isCurrentUserAdmin;             // 当前用户是否为管理员
+
+// 系统状态变量
+extern bool systemInitialized;             // 系统是否已初始化
+extern bool dataModified;                  // 数据是否已修改（用于判断是否需要保存）
+
+// 统计信息缓存（可选，用于提高性能）
+extern float overallAverageScore;          // 全体学生平均分
+extern float highestScore;                 // 最高分
+extern float lowestScore;                  // 最低分
+extern bool statsNeedUpdate;               // 统计信息是否需要更新
+
+#endif // GLOBALS_H
\ No newline at end of file
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..6d004a7
--- /dev/null
+++ b/main.c
@@ -0,0 +1,146 @@
+/**
+ * @file main.c
+ * @brief 学生成绩管理系统主程序
+ * @note 系统入口点，包含主要的程序流程控制
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef _WIN32
+#include <windows.h>
+#include <direct.h>
+#else
+#include <sys/stat.h>
+#include <unistd.h>
+#endif
+
+#include "config.h"
+#include "globals.h"
+#include "main_menu.h"
+#include "user_manage.h"
+#include "stu.data.h"
+#include "statistical_analysis.h"
+#include "auxiliary.h"
+#include "core_handlers.h"
+
+/**
+ * @brief 主程序入口
+ * @param argc 命令行参数个数
+ * @param argv 命令行参数数组
+ * @return 程序退出状态码
+ * @note 系统中有两个用户：
+   1. admin - 密码是 123456
+   2. teacher - 密码是 password
+ * @note
+   gcc -o student_system.exe main.c stu_data.c auxiliary.c statistical_analysis.c main_menu.c globals.c user_manage.c core_handlers.c
+   .\student_system.exe
+ */
+int main(int argc, char *argv[])
+{
+    // 设置控制台编码为UTF-8
+#ifdef _WIN32
+    system("chcp 65001 > nul"); // 设置控制台编码为UTF-8
+    SetConsoleOutputCP(65001);  // 设置控制台输出编码
+    SetConsoleCP(65001);        // 设置控制台输入编码
+#endif
+
+    // 初始化系统
+    if (!initializeSystem())
+    {
+        printError("系统初始化失败！");
+        return -1;
+    }
+
+    // 显示欢迎信息
+    clearScreen();
+    printHeader("学生成绩管理系统");
+    printf("\n");
+    printInfo("欢迎使用学生成绩管理系统！");
+    printf("\n");
+    pauseSystem();
+
+    // 用户登录
+    int loginAttempts = 0;
+    while (loginAttempts < MAX_LOGIN_ATTEMPTS)
+    {
+        clearScreen();
+        printHeader("用户登录");
+
+        if (loginSystem())
+        {
+            printSuccess("登录成功！");
+            printf("欢迎您，%s%s\n", currentUser,
+                   isCurrentUserAdmin ? " (管理员)" : " (普通用户)");
+            pauseSystem();
+            break;
+        }
+        else
+        {
+            loginAttempts++;
+            if (loginAttempts < MAX_LOGIN_ATTEMPTS)
+            {
+                printError("登录失败！请检查用户名和密码。");
+                printf("剩余尝试次数：%d\n", MAX_LOGIN_ATTEMPTS - loginAttempts);
+                pauseSystem();
+            }
+        }
+    }
+
+    // 登录失败次数过多，退出程序
+    if (loginAttempts >= MAX_LOGIN_ATTEMPTS)
+    {
+        printError("登录失败次数过多，程序将退出！");
+        cleanupSystem();
+        return -1;
+    }
+
+    // 主程序循环
+    int choice;
+    do
+    {
+        clearScreen();
+        displayMainMenu();
+        choice = safeInputInt("请选择功能", MENU_EXIT, MENU_ADMIN);
+
+        switch (choice)
+        {
+        case MENU_BASIC_FUNCTIONS:
+            handleBasicFunctions();
+            break;
+        case MENU_STATISTICS:
+            handleStatistics();
+            break;
+        case MENU_ADMIN:
+            if (isCurrentUserAdmin)
+            {
+                handleAdminFunctions();
+            }
+            else
+            {
+                printError("您没有管理员权限！");
+                pauseSystem();
+            }
+            break;
+        case MENU_EXIT:
+            // 保存数据并退出
+            if (dataModified)
+            {
+                printInfo("正在保存数据...");
+                saveStudentsToFile();
+                saveUsersToFile();
+                printSuccess("数据保存完成！");
+            }
+            printInfo("感谢使用学生成绩管理系统！");
+            break;
+        default:
+            printError("无效的选择！");
+            pauseSystem();
+            break;
+        }
+    } while (choice != MENU_EXIT);
+
+    // 清理系统资源
+    cleanupSystem();
+    return 0;
+}
\ No newline at end of file
diff --git a/main_menu.c b/main_menu.c
new file mode 100644
index 0000000..19dac7d
--- /dev/null
+++ b/main_menu.c
@@ -0,0 +1,92 @@
+/**
+ * @file main_menu.c
+ * @brief 主菜单实现文件
+ * @note 实现各种菜单显示功能
+ */
+
+ #include <stdio.h>
+ #include "main_menu.h"
+ #include "config.h"
+ #include "auxiliary.h"
+ #include "globals.h"
+ 
+ /**
+  * @brief 显示主菜单
+  */
+ void displayMainMenu()
+ {
+     printHeader("学生成绩管理系统 - 主菜单");
+     printf("\n");
+     printf("当前用户: %s %s\n", currentUser, 
+            isCurrentUserAdmin ? "(管理员)" : "(普通用户)");
+     printf("\n");
+     printf("1. 基本功能管理\n");
+     printf("2. 统计分析功能\n");
+     if (isCurrentUserAdmin)
+     {
+         printf("3. 系统管理功能\n");
+     }
+     printf("0. 退出系统\n");
+     printf("\n");
+     printSeparator();
+ }
+ 
+ /**
+  * @brief 显示基本功能菜单
+  */
+ void displayBasicFunctionsMenu()
+ {
+     printHeader("基本功能管理");
+     printf("\n");
+     printf("1. 添加学生信息\n");
+     printf("2. 删除学生信息\n");
+     printf("3. 修改学生信息\n");
+     printf("4. 按学号查找学生\n");
+     printf("5. 按姓名查找学生\n");
+     printf("6. 显示所有学生\n");
+     printf("7. 学生信息排序\n");
+     printf("0. 返回主菜单\n");
+     printf("\n");
+     printf("当前学生总数: %d\n", studentCount);
+     printf("\n");
+     printSeparator();
+ }
+ 
+ /**
+  * @brief 显示统计功能菜单
+  */
+ void displayStatisticsMenu()
+ {
+     printHeader("统计分析功能");
+     printf("\n");
+     printf("1. 课程统计分析\n");
+     printf("2. 成绩分布统计\n");
+     printf("3. 分数段统计\n");
+     printf("4. 综合统计分析\n");
+     printf("0. 返回主菜单\n");
+     printf("\n");
+     printf("当前学生总数: %d\n", studentCount);
+     if (studentCount > 0) {
+         printf("系统平均分: %.2f\n", overallAverageScore);
+     }
+     printf("\n");
+     printSeparator();
+ }
+ 
+ /**
+  * @brief 显示管理功能菜单
+  */
+ void displayAdminMenu()
+ {
+     printHeader("系统管理功能");
+     printf("\n");
+     printf("1. 添加用户账户\n");
+     printf("2. 删除用户账户\n");
+     printf("3. 修改用户密码\n");
+     printf("4. 查看所有用户\n");
+     printf("0. 返回主菜单\n");
+     printf("\n");
+     printf("当前用户总数: %d\n", userCount);
+     printf("\n");
+     printSeparator();
+ }
\ No newline at end of file
diff --git a/main_menu.h b/main_menu.h
new file mode 100644
index 0000000..9eff268
--- /dev/null
+++ b/main_menu.h
@@ -0,0 +1,12 @@
+#ifndef MAIN_MENU_H
+#define MAIN_MENU_H
+
+#include "config.h"
+
+// 主菜单和子菜单显示函数
+void displayMainMenu();           // 显示主菜单
+void displayBasicFunctionsMenu(); // 显示基本功能菜单
+void displayStatisticsMenu();     // 显示统计功能菜单
+void displayAdminMenu();          // 显示管理功能菜单
+
+#endif // MAIN_MENU_H
\ No newline at end of file
diff --git a/statistical_analysis.c b/statistical_analysis.c
new file mode 100644
index 0000000..8a134d1
--- /dev/null
+++ b/statistical_analysis.c
@@ -0,0 +1,488 @@
+/**
+ * @file statistical_analysis.c
+ * @brief 统计分析功能实现文件
+ * @note 实现各种统计分析功能
+ */
+
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include <math.h>
+ #include "statistical_analysis.h"
+ #include "config.h"
+ #include "globals.h"
+ #include "auxiliary.h"
+ #include "stu.data.h"
+ 
+ /**
+  * @brief 显示课程统计信息
+  */
+ void displayCourseStatistics()
+ {
+     clearScreen();
+     printHeader("课程统计信息");
+     
+     if (studentCount == 0)
+     {
+         printWarning("暂无学生数据！");
+         pauseSystem();
+         return;
+     }
+     
+     // 收集所有课程名称
+     char courses[MAX_STUDENTS * MAX_COURSES][MAX_COURSE_NAME_LENGTH];
+     int courseCount = 0;
+     
+     for (int i = 0; i < studentCount; i++) {
+         for (int j = 0; j < students[i].courseCount; j++) {
+             bool exists = false;
+             for (int k = 0; k < courseCount; k++) {
+                 if (strcmp(courses[k], students[i].courses[j]) == 0) {
+                     exists = true;
+                     break;
+                 }
+             }
+             if (!exists) {
+                 strcpy(courses[courseCount], students[i].courses[j]);
+                 courseCount++;
+             }
+         }
+     }
+     
+     if (courseCount == 0) {
+         printWarning("暂无课程数据！");
+         pauseSystem();
+         return;
+     }
+     
+     printf("\n");
+     printf("%-20s %-8s %-8s %-8s %-8s %-8s\n", 
+            "课程名称", "人数", "最高分", "最低分", "平均分", "及格率");
+     printSeparator();
+     
+     for (int i = 0; i < courseCount; i++) {
+         CourseStats stats = calculateCourseStats(courses[i]);
+         printf("%-20s %-8d %-8.2f %-8.2f %-8.2f %-8.2f%%\n",
+                courses[i], stats.studentCount, stats.maxScore, 
+                stats.minScore, stats.averageScore, stats.passRate);
+     }
+     
+     pauseSystem();
+ }
+ 
+ /**
+  * @brief 计算课程统计信息
+  */
+ CourseStats calculateCourseStats(const char* courseName) {
+     CourseStats stats = {0};
+     float scores[MAX_STUDENTS];
+     int count = 0;
+     
+     // 收集该课程的所有分数
+     for (int i = 0; i < studentCount; i++) {
+         for (int j = 0; j < students[i].courseCount; j++) {
+             if (strcmp(students[i].courses[j], courseName) == 0) {
+                 scores[count] = students[i].scores[j];
+                 count++;
+                 break;
+             }
+         }
+     }
+     
+     if (count == 0) return stats;
+     
+     stats.studentCount = count;
+     stats.maxScore = scores[0];
+     stats.minScore = scores[0];
+     stats.totalScore = 0;
+     
+     int passCount = 0;
+     
+     for (int i = 0; i < count; i++) {
+         if (scores[i] > stats.maxScore) stats.maxScore = scores[i];
+         if (scores[i] < stats.minScore) stats.minScore = scores[i];
+         stats.totalScore += scores[i];
+         
+         if (scores[i] >= PASS_SCORE) passCount++;
+     }
+     
+     stats.averageScore = stats.totalScore / count;
+     stats.passRate = (float)passCount / count * 100;
+     
+     return stats;
+ }
+ 
+ /**
+  * @brief 显示分数分布
+  */
+ void displayScoreDistribution() {
+     clearScreen();
+     printHeader("分数分布统计");
+     
+     if (studentCount == 0) {
+         printWarning("暂无学生数据！");
+         pauseSystem();
+         return;
+     }
+     
+     ScoreDistribution dist = calculateScoreDistribution();
+     
+     printf("\n分数段分布：\n");
+     printSeparator();
+     printf("90-100分: %d人 (%.2f%%)\n", dist.excellent, 
+            (float)dist.excellent / studentCount * 100);
+     printf("80-89分:  %d人 (%.2f%%)\n", dist.good, 
+            (float)dist.good / studentCount * 100);
+     printf("70-79分:  %d人 (%.2f%%)\n", dist.medium, 
+            (float)dist.medium / studentCount * 100);
+     printf("60-69分:  %d人 (%.2f%%)\n", dist.pass, 
+            (float)dist.pass / studentCount * 100);
+     printf("0-59分:   %d人 (%.2f%%)\n", dist.fail, 
+            (float)dist.fail / studentCount * 100);
+     
+     printf("\n总体统计：\n");
+     printf("总人数: %d\n", studentCount);
+     printf("及格人数: %d (%.2f%%)\n", 
+            studentCount - dist.fail, 
+            (float)(studentCount - dist.fail) / studentCount * 100);
+     printf("不及格人数: %d (%.2f%%)\n", 
+            dist.fail, (float)dist.fail / studentCount * 100);
+     
+     pauseSystem();
+ }
+ 
+ /**
+  * @brief 计算分数分布
+  */
+ ScoreDistribution calculateScoreDistribution() {
+     ScoreDistribution dist = {0};
+     
+     for (int i = 0; i < studentCount; i++) {
+         float avgScore = students[i].averageScore;
+         
+         if (avgScore >= 90) {
+             dist.excellent++;
+         } else if (avgScore >= 80) {
+             dist.good++;
+         } else if (avgScore >= 70) {
+             dist.medium++;
+         } else if (avgScore >= 60) {
+             dist.pass++;
+         } else {
+             dist.fail++;
+         }
+     }
+     
+     return dist;
+ }
+ 
+ /**
+  * @brief 显示学生排名
+  */
+ void displayStudentRanking() {
+     clearScreen();
+     printHeader("学生排名");
+     
+     if (studentCount == 0) {
+         printWarning("暂无学生数据！");
+         pauseSystem();
+         return;
+     }
+     
+     // 创建排名数组
+     StudentRank rankings[MAX_STUDENTS];
+     for (int i = 0; i < studentCount; i++) {
+         rankings[i].studentIndex = i;
+         rankings[i].averageScore = students[i].averageScore;
+         rankings[i].totalScore = students[i].totalScore;
+     }
+     
+     // 按平均分排序（降序）
+     for (int i = 0; i < studentCount - 1; i++) {
+         for (int j = 0; j < studentCount - 1 - i; j++) {
+             if (rankings[j].averageScore < rankings[j + 1].averageScore) {
+                 StudentRank temp = rankings[j];
+                 rankings[j] = rankings[j + 1];
+                 rankings[j + 1] = temp;
+             }
+         }
+     }
+     
+     printf("\n");
+     // 调整中文表头的对齐格式，考虑中文字符的显示宽度
+     printf("%-5s %-10s %-12s %-8s %-8s\n", 
+            "排名", "学号", "姓名", "总分", "平均分");
+     printf("========================================\n");
+     
+     for (int i = 0; i < studentCount; i++) {
+         int idx = rankings[i].studentIndex;
+         printf("%-5d %-10s %-12s %-8.2f %-8.2f\n",
+                i + 1,
+                students[idx].studentID,
+                students[idx].name,
+                students[idx].totalScore,
+                students[idx].averageScore);
+     }
+     
+     pauseSystem();
+ }
+ 
+ /**
+  * @brief 显示系统总体统计
+  */
+ void displayOverallStatistics() {
+     clearScreen();
+     printHeader("系统总体统计");
+     
+     if (studentCount == 0) {
+         printWarning("暂无学生数据！");
+         pauseSystem();
+         return;
+     }
+     
+     OverallStats stats = calculateOverallStats();
+     
+     printf("\n学生信息统计：\n");
+     printSeparator();
+     printf("总学生数: %d\n", stats.totalStudents);
+     printf("男学生数: %d (%.2f%%)\n", stats.maleCount, 
+            (float)stats.maleCount / stats.totalStudents * 100);
+     printf("女学生数: %d (%.2f%%)\n", stats.femaleCount, 
+            (float)stats.femaleCount / stats.totalStudents * 100);
+     printf("平均年龄: %.1f岁\n", stats.averageAge);
+     
+     printf("\n成绩统计：\n");
+     printSeparator();
+     printf("最高平均分: %.2f\n", stats.highestAverage);
+     printf("最低平均分: %.2f\n", stats.lowestAverage);
+     printf("全体平均分: %.2f\n", stats.overallAverageScore);
+     printf("标准差: %.2f\n", stats.standardDeviation);
+     
+     printf("\n课程统计：\n");
+     printSeparator();
+     printf("总课程数: %d\n", stats.totalCourses);
+     printf("平均课程数/人: %.1f\n", stats.averageCoursesPerStudent);
+     
+     pauseSystem();
+ }
+ 
+ /**
+  * @brief 计算系统总体统计
+  */
+ OverallStats calculateOverallStats() {
+     OverallStats stats = {0};
+     
+     if (studentCount == 0) return stats;
+     
+     stats.totalStudents = studentCount;
+     
+     float totalAge = 0;
+     float totalAverage = 0;
+     int totalCourseCount = 0;
+     
+     // 收集所有课程名称
+     char courses[MAX_STUDENTS * MAX_COURSES][MAX_COURSE_NAME_LENGTH];
+     int uniqueCourseCount = 0;
+     
+     stats.highestAverage = students[0].averageScore;
+     stats.lowestAverage = students[0].averageScore;
+     
+     for (int i = 0; i < studentCount; i++) {
+         // 性别统计
+         if (students[i].gender == GENDER_MALE) {
+             stats.maleCount++;
+         } else if (students[i].gender == GENDER_FEMALE) {
+             stats.femaleCount++;
+         }
+         
+         // 年龄统计
+         totalAge += students[i].age;
+         
+         // 成绩统计
+         totalAverage += students[i].averageScore;
+         totalCourseCount += students[i].courseCount;
+         
+         if (students[i].averageScore > stats.highestAverage) {
+             stats.highestAverage = students[i].averageScore;
+         }
+         if (students[i].averageScore < stats.lowestAverage) {
+             stats.lowestAverage = students[i].averageScore;
+         }
+         
+         // 课程统计
+         for (int j = 0; j < students[i].courseCount; j++) {
+             bool exists = false;
+             for (int k = 0; k < uniqueCourseCount; k++) {
+                 if (strcmp(courses[k], students[i].courses[j]) == 0) {
+                     exists = true;
+                     break;
+                 }
+             }
+             if (!exists) {
+                 strcpy(courses[uniqueCourseCount], students[i].courses[j]);
+                 uniqueCourseCount++;
+             }
+         }
+     }
+     
+     stats.averageAge = totalAge / studentCount;
+     stats.overallAverageScore = totalAverage / studentCount;
+     stats.totalCourses = uniqueCourseCount;
+     stats.averageCoursesPerStudent = (float)totalCourseCount / studentCount;
+     
+     // 计算标准差
+     float variance = 0;
+     for (int i = 0; i < studentCount; i++) {
+         float diff = students[i].averageScore - stats.overallAverageScore;
+         variance += diff * diff;
+     }
+     variance /= studentCount;
+     stats.standardDeviation = sqrt(variance);
+     
+     return stats;
+ }
+ 
+ /**
+  * @brief 查找最高分学生
+  */
+ void findTopStudent() {
+     clearScreen();
+     printHeader("最高分学生");
+     
+     if (studentCount == 0) {
+         printWarning("暂无学生数据！");
+         pauseSystem();
+         return;
+     }
+     
+     int topIndex = 0;
+     for (int i = 1; i < studentCount; i++) {
+         if (students[i].averageScore > students[topIndex].averageScore) {
+             topIndex = i;
+         }
+     }
+     
+     printf("\n最高平均分学生：\n");
+     displayStudentInfo(&students[topIndex]);
+     
+     pauseSystem();
+ }
+ 
+ /**
+  * @brief 查找最低分学生
+  */
+ void findBottomStudent() {
+     clearScreen();
+     printHeader("最低分学生");
+     
+     if (studentCount == 0) {
+         printWarning("暂无学生数据！");
+         pauseSystem();
+         return;
+     }
+     
+     int bottomIndex = 0;
+     for (int i = 1; i < studentCount; i++) {
+         if (students[i].averageScore < students[bottomIndex].averageScore) {
+             bottomIndex = i;
+         }
+     }
+     
+     printf("\n最低平均分学生：\n");
+     displayStudentInfo(&students[bottomIndex]);
+     
+     pauseSystem();
+ }
+ 
+ /**
+  * @brief 按课程查找最高分
+  */
+ void findTopScoreInCourse() {
+     clearScreen();
+     printHeader("课程最高分查询");
+     
+     if (studentCount == 0) {
+         printWarning("暂无学生数据！");
+         pauseSystem();
+         return;
+     }
+     
+     char courseName[MAX_COURSE_NAME_LENGTH];
+     printf("\n");
+     safeInputString("请输入课程名称", courseName, MAX_COURSE_NAME_LENGTH);
+     
+     float maxScore = -1;
+     int maxIndex = -1;
+     
+     for (int i = 0; i < studentCount; i++) {
+         for (int j = 0; j < students[i].courseCount; j++) {
+             if (strcmp(students[i].courses[j], courseName) == 0) {
+                 if (students[i].scores[j] > maxScore) {
+                     maxScore = students[i].scores[j];
+                     maxIndex = i;
+                 }
+             }
+         }
+     }
+     
+     if (maxIndex == -1) {
+         printError("未找到该课程！");
+     } else {
+         printf("\n课程 \"%s\" 最高分：\n", courseName);
+         printSeparator();
+         printf("学号: %s\n", students[maxIndex].studentID);
+         printf("姓名: %s\n", students[maxIndex].name);
+         printf("分数: %.2f\n", maxScore);
+     }
+     
+     pauseSystem();
+ }
+ 
+ /**
+  * @brief 计算学生统计信息
+  */
+ void calculateStudentStats(Student* student) {
+     if (student->courseCount == 0) {
+         student->totalScore = 0;
+         student->averageScore = 0;
+         return;
+     }
+     
+     student->totalScore = 0;
+     for (int i = 0; i < student->courseCount; i++) {
+         student->totalScore += student->scores[i];
+     }
+     
+     student->averageScore = student->totalScore / student->courseCount;
+ }
+ 
+ /**
+  * @brief 更新全局统计缓存
+  */
+ void updateGlobalStats() {
+     if (studentCount == 0) {
+         overallAverageScore = 0;
+         highestScore = 0;
+         lowestScore = 0;
+         statsNeedUpdate = false;
+         return;
+     }
+     
+     float total = 0;
+     highestScore = students[0].averageScore;
+     lowestScore = students[0].averageScore;
+     
+     for (int i = 0; i < studentCount; i++) {
+         total += students[i].averageScore;
+         
+         if (students[i].averageScore > highestScore) {
+             highestScore = students[i].averageScore;
+         }
+         if (students[i].averageScore < lowestScore) {
+             lowestScore = students[i].averageScore;
+         }
+     }
+     
+     overallAverageScore = total / studentCount;
+     statsNeedUpdate = false;
+ }
\ No newline at end of file
diff --git a/statistical_analysis.h b/statistical_analysis.h
new file mode 100644
index 0000000..b34b9eb
--- /dev/null
+++ b/statistical_analysis.h
@@ -0,0 +1,71 @@
+/**
+ * @file statistical_analysis.h
+ * @brief 统计分析功能头文件
+ * @note 包含各种统计分析功能的函数声明
+ */
+
+#ifndef STATISTICAL_ANALYSIS_H
+#define STATISTICAL_ANALYSIS_H
+
+#include "config.h"
+#include "main_menu.h"
+
+// 课程统计结构体
+typedef struct {
+    int studentCount;
+    float maxScore;
+    float minScore;
+    float totalScore;
+    float averageScore;
+    float passRate;
+} CourseStats;
+
+// 分数分布结构体
+typedef struct {
+    int excellent;  // 90-100分
+    int good;       // 80-89分
+    int medium;     // 70-79分
+    int pass;       // 60-69分
+    int fail;       // 0-59分
+} ScoreDistribution;
+
+// 学生排名结构体
+typedef struct {
+    int studentIndex;
+    float averageScore;
+    float totalScore;
+} StudentRank;
+
+// 总体统计结构体
+typedef struct {
+    int totalStudents;
+    int maleCount;
+    int femaleCount;
+    float averageAge;
+    float highestAverage;
+    float lowestAverage;
+    float overallAverageScore;
+    float standardDeviation;
+    int totalCourses;
+    float averageCoursesPerStudent;
+} OverallStats;
+
+// 主要统计分析函数
+void displayCourseStatistics();             // 显示课程统计信息
+void displayScoreDistribution();            // 显示分数分布
+void displayStudentRanking();               // 显示学生排名
+void displayOverallStatistics();            // 显示系统总体统计
+
+// 查找功能
+void findTopStudent();                       // 查找最高分学生
+void findBottomStudent();                    // 查找最低分学生
+void findTopScoreInCourse();                 // 按课程查找最高分
+
+// 计算函数
+CourseStats calculateCourseStats(const char* courseName);
+ScoreDistribution calculateScoreDistribution();
+OverallStats calculateOverallStats();
+void calculateStudentStats(Student* student);
+void updateGlobalStats();
+
+#endif // STATISTICAL_ANALYSIS_H
\ No newline at end of file
diff --git a/stu.data.h b/stu.data.h
new file mode 100644
index 0000000..d4c96fa
--- /dev/null
+++ b/stu.data.h
@@ -0,0 +1,18 @@
+#ifndef STU_DATA_H
+#define STU_DATA_H
+
+#include "config.h"
+
+// 学生数据管理相关函数 (CRUD)
+void loadStudentsFromFile();                // 从文件加载学生数据
+void saveStudentsToFile();                  // 将学生数据保存到文件
+void addStudent();                          // 增加学生信息
+void deleteStudent();                       // 删除学生信息
+void modifyStudent();                       // 修改学生信息
+void searchStudentByID();                   // 按学号查找学生
+void searchStudentByName();                 // 按姓名查找学生
+void displayAllStudents();                  // 显示所有学生信息
+void displayStudentInfo(const Student* student); // 显示单个学生信息
+void sortStudents(int criteria, int order); // 统一排序函数，根据参数选择排序依据和升降序
+
+#endif // STU_DATA_H
\ No newline at end of file
diff --git a/stu_data.c b/stu_data.c
new file mode 100644
index 0000000..1b8ffd2
--- /dev/null
+++ b/stu_data.c
@@ -0,0 +1,614 @@
+/**
+ * @file stu_data.c
+ * @brief 学生数据管理实现文件
+ * @note 实现学生信息的增删改查功能
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "stu.data.h"
+#include "config.h"
+#include "globals.h"
+#include "auxiliary.h"
+#include "statistical_analysis.h"
+
+/**
+ * @brief 从CSV文件加载学生数据
+ */
+void loadStudentsFromFile() {
+    FILE* file = fopen(STUDENTS_FILE, "r");
+    if (file == NULL) {
+        studentCount = 0;
+        printInfo("学生数据文件不存在，将创建新文件。");
+        return;
+    }
+    
+    char line[1024];
+    studentCount = 0;
+    
+    // 跳过CSV头部
+    if (fgets(line, sizeof(line), file) == NULL) {
+        fclose(file);
+        studentCount = 0;
+        return;
+    }
+    
+    // 读取学生数据
+    while (fgets(line, sizeof(line), file) != NULL && studentCount < MAX_STUDENTS) {
+        Student* student = &students[studentCount];
+        memset(student, 0, sizeof(Student));
+        
+        // 解析CSV行
+        char* token = strtok(line, ",");
+        if (token == NULL) continue;
+        
+        // 学号
+        strncpy(student->studentID, token, MAX_ID_LENGTH - 1);
+        
+        // 姓名
+        token = strtok(NULL, ",");
+        if (token == NULL) continue;
+        strncpy(student->name, token, MAX_NAME_LENGTH - 1);
+        
+        // 年龄
+        token = strtok(NULL, ",");
+        if (token == NULL) continue;
+        student->age = atoi(token);
+        
+        // 性别
+        token = strtok(NULL, ",");
+        if (token == NULL) continue;
+        student->gender = token[0];
+        
+        // 课程数量
+        token = strtok(NULL, ",");
+        if (token == NULL) continue;
+        student->courseCount = atoi(token);
+        
+        // 课程和成绩
+        for (int i = 0; i < student->courseCount && i < MAX_COURSES; i++) {
+            // 课程名称
+            token = strtok(NULL, ",");
+            if (token == NULL) break;
+            strncpy(student->courses[i], token, MAX_COURSE_NAME_LENGTH - 1);
+            
+            // 成绩
+            token = strtok(NULL, ",");
+            if (token == NULL) break;
+            student->scores[i] = atof(token);
+        }
+        
+        // 总分
+        token = strtok(NULL, ",");
+        if (token != NULL) {
+            student->totalScore = atof(token);
+        }
+        
+        // 平均分
+        token = strtok(NULL, ",");
+        if (token != NULL) {
+            student->averageScore = atof(token);
+        }
+        
+        studentCount++;
+    }
+    
+    fclose(file);
+    
+    // 更新统计信息
+    statsNeedUpdate = true;
+}
+
+/**
+ * @brief 将学生数据保存到CSV文件
+ */
+void saveStudentsToFile() {
+    FILE* file = fopen(STUDENTS_FILE, "w");
+    if (file == NULL) {
+        printError("无法保存学生数据！");
+        return;
+    }
+    
+    // 写入CSV头部
+    fprintf(file, "学号,姓名,年龄,性别,课程数量");
+    for (int i = 0; i < MAX_COURSES; i++) {
+        fprintf(file, ",课程%d,成绩%d", i+1, i+1);
+    }
+    fprintf(file, ",总分,平均分\n");
+    
+    // 写入学生数据
+    for (int i = 0; i < studentCount; i++) {
+        Student* student = &students[i];
+        
+        // 基本信息
+        fprintf(file, "%s,%s,%d,%c,%d",
+                student->studentID,
+                student->name,
+                student->age,
+                student->gender,
+                student->courseCount);
+        
+        // 课程和成绩
+        for (int j = 0; j < MAX_COURSES; j++) {
+            if (j < student->courseCount) {
+                fprintf(file, ",%s,%.2f", student->courses[j], student->scores[j]);
+            } else {
+                fprintf(file, ",,");  // 空的课程和成绩
+            }
+        }
+        
+        // 总分和平均分
+        fprintf(file, ",%.2f,%.2f\n", student->totalScore, student->averageScore);
+    }
+    
+    fclose(file);
+    dataModified = false;
+    
+    printSuccess("学生数据已保存到CSV文件！");
+}
+
+/**
+ * @brief 添加学生信息
+ */
+void addStudent() {
+    clearScreen();
+    printHeader("添加学生信息");
+    
+    if (studentCount >= MAX_STUDENTS) {
+        printError("学生数量已达上限！");
+        pauseSystem();
+        return;
+    }
+    
+    Student newStudent;
+    memset(&newStudent, 0, sizeof(Student));
+    
+    printf("\n");
+    
+    // 输入学号
+    while (1) {
+        safeInputString("请输入学号", newStudent.studentID, MAX_ID_LENGTH);
+        
+        if (!isValidStudentID(newStudent.studentID)) {
+            printError("学号格式无效！");
+            continue;
+        }
+        
+        // 检查学号是否已存在
+        bool exists = false;
+        for (int i = 0; i < studentCount; i++) {
+            if (strcmp(students[i].studentID, newStudent.studentID) == 0) {
+                printError("学号已存在！");
+                exists = true;
+                break;
+            }
+        }
+        
+        if (!exists) break;
+    }
+    
+    // 输入姓名
+    while (1) {
+        safeInputString("请输入姓名", newStudent.name, MAX_NAME_LENGTH);
+    if (isValidName(newStudent.name)) break;
+        printError("姓名格式无效！");
+    }
+    
+    // 输入年龄
+    newStudent.age = safeInputInt("请输入年龄", 10, 100);
+    
+    // 输入性别
+    while (1) {
+        printf("请输入性别 (M/F): ");
+        char gender;
+        scanf(" %c", &gender);
+        clearInputBuffer();
+        
+        if (isValidGender(gender)) {
+            newStudent.gender = gender;
+            break;
+        }
+        printError("性别输入无效！请输入 M 或 F");
+    }
+    
+    // 输入课程信息
+    printf("\n开始输入课程信息：\n");
+    newStudent.courseCount = 0;
+    
+    while (newStudent.courseCount < MAX_COURSES) {
+        printf("\n第 %d 门课程：\n", newStudent.courseCount + 1);
+        
+        safeInputString("课程名称", 
+                       newStudent.courses[newStudent.courseCount], 
+                       MAX_COURSE_NAME_LENGTH);
+        
+        newStudent.scores[newStudent.courseCount] = 
+            safeInputFloat("课程分数", MIN_SCORE, MAX_SCORE);
+        
+        newStudent.courseCount++;
+        
+        if (newStudent.courseCount < MAX_COURSES) {
+            printf("\n是否继续添加课程？(y/n): ");
+            char choice;
+            scanf(" %c", &choice);
+            clearInputBuffer();
+            
+            if (choice != 'y' && choice != 'Y') {
+                break;
+            }
+        }
+    }
+    
+    // 计算总分和平均分
+    calculateStudentStats(&newStudent);
+    
+    // 添加到数组
+    students[studentCount] = newStudent;
+    studentCount++;
+    
+    // 标记数据已修改
+    dataModified = true;
+    statsNeedUpdate = true;
+    
+    printSuccess("学生信息添加成功！");
+    printf("学号: %s\n", newStudent.studentID);
+    printf("姓名: %s\n", newStudent.name);
+    printf("总分: %.2f\n", newStudent.totalScore);
+    printf("平均分: %.2f\n", newStudent.averageScore);
+    
+    pauseSystem();
+}
+
+/**
+ * @brief 删除学生信息
+ */
+void deleteStudent() {
+    clearScreen();
+    printHeader("删除学生信息");
+    
+    if (studentCount == 0) {
+        printWarning("暂无学生数据！");
+        pauseSystem();
+        return;
+    }
+    
+    char studentID[MAX_ID_LENGTH];
+    printf("\n");
+    safeInputString("请输入要删除的学生学号", studentID, MAX_ID_LENGTH);
+    
+    // 查找学生
+    for (int i = 0; i < studentCount; i++) {
+        if (strcmp(students[i].studentID, studentID) == 0) {
+            printf("\n找到学生信息：\n");
+            printf("学号: %s\n", students[i].studentID);
+            printf("姓名: %s\n", students[i].name);
+            
+            printf("\n确认删除？(y/n): ");
+            char choice;
+            scanf(" %c", &choice);
+            clearInputBuffer();
+            
+            if (choice == 'y' || choice == 'Y') {
+                // 移动后面的学生向前
+                for (int j = i; j < studentCount - 1; j++) {
+                    students[j] = students[j + 1];
+                }
+                studentCount--;
+                
+                dataModified = true;
+                statsNeedUpdate = true;
+                
+                printSuccess("学生信息删除成功！");
+            } else {
+                printInfo("删除操作已取消。");
+            }
+            
+            pauseSystem();
+            return;
+        }
+    }
+    
+    printError("未找到该学号的学生！");
+    pauseSystem();
+}
+
+/**
+ * @brief 修改学生信息
+ */
+void modifyStudent() {
+    clearScreen();
+    printHeader("修改学生信息");
+    
+    if (studentCount == 0) {
+        printWarning("暂无学生数据！");
+        pauseSystem();
+        return;
+    }
+    
+    char studentID[MAX_ID_LENGTH];
+    printf("\n");
+    safeInputString("请输入要修改的学生学号", studentID, MAX_ID_LENGTH);
+    
+    // 查找学生
+    for (int i = 0; i < studentCount; i++) {
+        if (strcmp(students[i].studentID, studentID) == 0) {
+            printf("\n找到学生信息：\n");
+            printf("学号: %s\n", students[i].studentID);
+            printf("姓名: %s\n", students[i].name);
+            printf("年龄: %d\n", students[i].age);
+            printf("性别: %c\n", students[i].gender);
+            
+            printf("\n修改选项：\n");
+            printf("1. 修改姓名\n");
+            printf("2. 修改年龄\n");
+            printf("3. 修改性别\n");
+            printf("4. 修改课程成绩\n");
+            printf("0. 返回\n");
+            
+            int choice = safeInputInt("请选择修改项", 0, 4);
+            
+            switch (choice) {
+                case 1: // 修改姓名
+                    safeInputString("请输入新姓名", students[i].name, MAX_NAME_LENGTH);
+                    break;
+                case 2:
+                    students[i].age = safeInputInt("请输入新年龄", 10, 100);
+                    break;
+                case 3:
+                    while (1) {
+                        printf("请输入新性别 (M/F): ");
+                        char gender;
+                        scanf(" %c", &gender);
+                        clearInputBuffer();
+                        
+                        if (isValidGender(gender)) {
+                            students[i].gender = gender;
+                            break;
+                        }
+                        printError("性别输入无效！");
+                    }
+                    break;
+                case 4:
+                    printf("\n当前课程列表：\n");
+                    for (int j = 0; j < students[i].courseCount; j++) {
+                        printf("%d. %s: %.2f\n", j + 1, students[i].courses[j], students[i].scores[j]);
+                    }
+                    
+                    printf("\n修改选项：\n");
+                    printf("1. 修改现有课程成绩\n");
+                    printf("2. 添加新课程\n");
+                    printf("3. 删除课程\n");
+                    printf("0. 返回\n");
+                    
+                    int courseChoice = safeInputInt("请选择操作", 0, 3);
+                    switch (courseChoice) {
+                        case 1: // 修改现有课程成绩
+                            if (students[i].courseCount == 0) {
+                                printWarning("该学生没有课程记录！");
+                                break;
+                            }
+                            
+                            int courseIndex = safeInputInt("请选择要修改的课程", 1, students[i].courseCount) - 1;
+                            students[i].scores[courseIndex] = safeInputFloat("新成绩", MIN_SCORE, MAX_SCORE);
+                            break;
+                            
+                        case 2: // 添加新课程
+                            if (students[i].courseCount >= MAX_COURSES) {
+                                printWarning("课程数量已达上限！");
+                                break;
+                            }
+                            
+                            safeInputString("课程名称", students[i].courses[students[i].courseCount], MAX_COURSE_NAME_LENGTH);
+                            students[i].scores[students[i].courseCount] = safeInputFloat("课程成绩", MIN_SCORE, MAX_SCORE);
+                            students[i].courseCount++;
+                            break;
+                            
+                        case 3: // 删除课程
+                            if (students[i].courseCount == 0) {
+                                printWarning("该学生没有课程记录！");
+                                break;
+                            }
+                            
+                            courseIndex = safeInputInt("请选择要删除的课程", 1, students[i].courseCount) - 1;
+                            
+                            // 移动数组元素
+                            for (int k = courseIndex; k < students[i].courseCount - 1; k++) {
+                                strcpy(students[i].courses[k], students[i].courses[k + 1]);
+                                students[i].scores[k] = students[i].scores[k + 1];
+                            }
+                            students[i].courseCount--;
+                            break;
+                    }
+                    break;
+                case 0:
+                    return;
+            }
+            
+            if (choice == 4) {
+                calculateStudentStats(&students[i]);
+            }
+            
+            dataModified = true;
+            statsNeedUpdate = true;
+            
+            printSuccess("学生信息修改成功！");
+            pauseSystem();
+            return;
+        }
+    }
+    
+    printError("未找到该学号的学生！");
+    pauseSystem();
+}
+
+/**
+ * @brief 修改学生课程成绩
+ */
+/**
+ * @brief 按学号查找学生
+ */
+void searchStudentByID() {
+    clearScreen();
+    printHeader("按学号查找学生");
+    
+    if (studentCount == 0) {
+        printWarning("暂无学生数据！");
+        pauseSystem();
+        return;
+    }
+    
+    char studentID[MAX_ID_LENGTH];
+    printf("\n");
+    safeInputString("请输入学号", studentID, MAX_ID_LENGTH);
+    
+    for (int i = 0; i < studentCount; i++) {
+        if (strcmp(students[i].studentID, studentID) == 0) {
+            displayStudentInfo(&students[i]);
+            pauseSystem();
+            return;
+        }
+    }
+    
+    printError("未找到该学号的学生！");
+    pauseSystem();
+}
+
+/**
+ * @brief 按姓名查找学生
+ */
+void searchStudentByName() {
+    clearScreen();
+    printHeader("按姓名查找学生");
+    
+    if (studentCount == 0) {
+        printWarning("暂无学生数据！");
+        pauseSystem();
+        return;
+    }
+    
+    char name[MAX_NAME_LENGTH];
+    printf("\n");
+    safeInputString("请输入姓名（支持模糊查找）", name, MAX_NAME_LENGTH);
+    
+    bool found = false;
+    for (int i = 0; i < studentCount; i++) {
+        if (strstr(students[i].name, name) != NULL) {
+            if (!found) {
+                printf("\n找到以下匹配的学生：\n");
+                printSeparator();
+                found = true;
+            }
+            displayStudentInfo(&students[i]);
+            printf("\n");
+        }
+    }
+    
+    if (!found) {
+        printError("未找到匹配的学生！");
+    }
+    
+    pauseSystem();
+}
+
+/**
+ * @brief 显示所有学生信息
+ */
+void displayAllStudents() {
+    clearScreen();
+    printHeader("所有学生信息");
+    
+    if (studentCount == 0) {
+        printWarning("暂无学生数据！");
+        pauseSystem();
+        return;
+    }
+    
+    printf("\n");
+    // 调整中文表头的对齐格式，考虑中文字符的显示宽度
+    printf("%-10s %-12s %-6s %-6s %-8s %-8s\n", 
+           "学号", "姓名", "年龄", "性别", "总分", "平均分");
+    printf("========================================\n");
+    
+    for (int i = 0; i < studentCount; i++) {
+        printf("%-10s %-12s %-6d %-6c %-8.2f %-8.2f\n",
+               students[i].studentID,
+               students[i].name,
+               students[i].age,
+               students[i].gender,
+               students[i].totalScore,
+               students[i].averageScore);
+    }
+    
+    printf("\n总学生数: %d\n", studentCount);
+    pauseSystem();
+}
+
+/**
+ * @brief 显示单个学生详细信息
+ */
+void displayStudentInfo(const Student* student) {
+    printf("\n学生详细信息：\n");
+    printSeparator();
+    printf("学号: %s\n", student->studentID);
+    printf("姓名: %s\n", student->name);
+    printf("年龄: %d\n", student->age);
+    printf("性别: %c\n", student->gender);
+    printf("课程数量: %d\n", student->courseCount);
+    
+    if (student->courseCount > 0) {
+        printf("\n课程成绩：\n");
+        for (int i = 0; i < student->courseCount; i++) {
+            printf("  %s: %.2f分\n", 
+                   student->courses[i], 
+                   student->scores[i]);
+        }
+        printf("\n总分: %.2f\n", student->totalScore);
+        printf("平均分: %.2f\n", student->averageScore);
+    }
+}
+
+/**
+ * @brief 排序学生信息
+ */
+void sortStudents(int criteria, int order) {
+    if (studentCount <= 1) return;
+    
+    // 使用冒泡排序
+    for (int i = 0; i < studentCount - 1; i++) {
+        for (int j = 0; j < studentCount - 1 - i; j++) {
+            bool shouldSwap = false;
+            
+            switch (criteria) {
+                case SORT_BY_ID:
+                    shouldSwap = (order == SORT_ASCENDING) ? 
+                        strcmp(students[j].studentID, students[j + 1].studentID) > 0 :
+                        strcmp(students[j].studentID, students[j + 1].studentID) < 0;
+                    break;
+                case SORT_BY_NAME:
+                    shouldSwap = (order == SORT_ASCENDING) ? 
+                        strcmp(students[j].name, students[j + 1].name) > 0 :
+                        strcmp(students[j].name, students[j + 1].name) < 0;
+                    break;
+                case SORT_BY_TOTAL_SCORE:
+                    shouldSwap = (order == SORT_ASCENDING) ? 
+                        students[j].totalScore > students[j + 1].totalScore :
+                        students[j].totalScore < students[j + 1].totalScore;
+                    break;
+                case SORT_BY_AVERAGE_SCORE:
+                    shouldSwap = (order == SORT_ASCENDING) ? 
+                        students[j].averageScore > students[j + 1].averageScore :
+                        students[j].averageScore < students[j + 1].averageScore;
+                    break;
+            }
+            
+            if (shouldSwap) {
+                Student temp = students[j];
+                students[j] = students[j + 1];
+                students[j + 1] = temp;
+            }
+        }
+    }
+    
+    dataModified = true;
+}
\ No newline at end of file
diff --git a/student_system.exe b/student_system.exe
new file mode 100644
index 0000000..b6c3975
Binary files /dev/null and b/student_system.exe differ
diff --git a/student_system_new.exe b/student_system_new.exe
new file mode 100644
index 0000000..011f1f3
Binary files /dev/null and b/student_system_new.exe differ
diff --git a/test_ranking.txt b/test_ranking.txt
new file mode 100644
index 0000000..683a0ac
--- /dev/null
+++ b/test_ranking.txt
@@ -0,0 +1,6 @@
+admin
+123456
+2
+3
+0
+0
\ No newline at end of file
diff --git a/user_manage.c b/user_manage.c
new file mode 100644
index 0000000..1857a9d
--- /dev/null
+++ b/user_manage.c
@@ -0,0 +1,265 @@
+/**
+ * @file user_manage.c
+ * @brief 用户管理实现文件
+ * @note 实现用户认证和管理功能
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "user_manage.h"
+#include "config.h"
+#include "globals.h"
+#include "auxiliary.h"
+
+/**
+ * @brief 处理用户登录
+ * @return 登录成功返回1，失败返回0
+ */
+int loginSystem() {
+    char username[MAX_USERNAME_LENGTH];
+    char password[MAX_PASSWORD_LENGTH];
+    
+    printf("\n");
+    safeInputString("请输入用户名", username, MAX_USERNAME_LENGTH);
+    safeInputString("请输入密码", password, MAX_PASSWORD_LENGTH);
+    
+    // 验证用户名和密码
+    for (int i = 0; i < userCount; i++) {
+        if (strcmp(users[i].username, username) == 0 && 
+            strcmp(users[i].password, password) == 0) {
+            // 登录成功
+            strcpy(currentUser, username);
+            isCurrentUserAdmin = users[i].isAdmin;
+            return 1;
+        }
+    }
+    
+    return 0; // 登录失败
+}
+
+/**
+ * @brief 从文件加载用户数据
+ */
+void loadUsersFromFile() {
+    FILE* file = fopen(USERS_FILE, "r");
+    if (file == NULL) {
+        // 文件不存在，创建默认管理员账户
+        strcpy(users[0].username, "admin");
+        strcpy(users[0].password, "123456");
+        users[0].isAdmin = true;
+        
+        strcpy(users[1].username, "teacher");
+        strcpy(users[1].password, "password");
+        users[1].isAdmin = false;
+        
+        userCount = 2;
+        
+        // 保存默认用户到文件
+        saveUsersToFile();
+        printInfo("已创建默认用户账户：");
+        printInfo("管理员 - 用户名: admin, 密码: 123456");
+        printInfo("普通用户 - 用户名: teacher, 密码: password");
+        return;
+    }
+    
+    userCount = 0;
+    char line[200];
+    
+    while (fgets(line, sizeof(line), file) && userCount < MAX_USERS) {
+        // 移除换行符
+        line[strcspn(line, "\n")] = '\0';
+        
+        // 解析格式：username:password:isAdmin
+        char* username = strtok(line, ":");
+        char* password = strtok(NULL, ":");
+        char* adminFlag = strtok(NULL, ":");
+        
+        if (username && password && adminFlag) {
+            strcpy(users[userCount].username, username);
+            strcpy(users[userCount].password, password);
+            users[userCount].isAdmin = (strcmp(adminFlag, "1") == 0);
+            userCount++;
+        }
+    }
+    
+    fclose(file);
+}
+
+/**
+ * @brief 将用户数据保存到文件
+ */
+void saveUsersToFile() {
+    FILE* file = fopen(USERS_FILE, "w");
+    if (file == NULL) {
+        printError("无法保存用户数据！");
+        return;
+    }
+    
+    for (int i = 0; i < userCount; i++) {
+        fprintf(file, "%s:%s:%d\n", 
+                users[i].username, 
+                users[i].password, 
+                users[i].isAdmin ? 1 : 0);
+    }
+    
+    fclose(file);
+}
+
+/**
+ * @brief 增加用户账户
+ */
+void addUserAccount() {
+    clearScreen();
+    printHeader("添加用户账户");
+    
+    if (userCount >= MAX_USERS) {
+        printError("用户数量已达上限！");
+        pauseSystem();
+        return;
+    }
+    
+    char username[MAX_USERNAME_LENGTH];
+    char password[MAX_PASSWORD_LENGTH];
+    
+    printf("\n");
+    safeInputString("请输入新用户名", username, MAX_USERNAME_LENGTH);
+    
+    // 检查用户名是否已存在
+    for (int i = 0; i < userCount; i++) {
+        if (strcmp(users[i].username, username) == 0) {
+            printError("用户名已存在！");
+            pauseSystem();
+            return;
+        }
+    }
+    
+    safeInputString("请输入密码", password, MAX_PASSWORD_LENGTH);
+    
+    printf("\n用户类型：\n");
+    printf("1. 普通用户\n");
+    printf("2. 管理员\n");
+    int userType = safeInputInt("请选择用户类型", 1, 2);
+    
+    // 添加新用户
+    strcpy(users[userCount].username, username);
+    strcpy(users[userCount].password, password);
+    users[userCount].isAdmin = (userType == 2);
+    userCount++;
+    
+    // 保存到文件
+    saveUsersToFile();
+    dataModified = true;
+    
+    printSuccess("用户添加成功！");
+    pauseSystem();
+}
+
+/**
+ * @brief 删除用户账户
+ */
+void deleteUserAccount() {
+    clearScreen();
+    printHeader("删除用户账户");
+    
+    if (userCount <= 1) {
+        printError("至少需要保留一个用户账户！");
+        pauseSystem();
+        return;
+    }
+    
+    char username[MAX_USERNAME_LENGTH];
+    printf("\n");
+    safeInputString("请输入要删除的用户名", username, MAX_USERNAME_LENGTH);
+    
+    // 不能删除当前登录用户
+    if (strcmp(username, currentUser) == 0) {
+        printError("不能删除当前登录的用户！");
+        pauseSystem();
+        return;
+    }
+    
+    // 查找并删除用户
+    for (int i = 0; i < userCount; i++) {
+        if (strcmp(users[i].username, username) == 0) {
+            // 移动后面的用户向前
+            for (int j = i; j < userCount - 1; j++) {
+                users[j] = users[j + 1];
+            }
+            userCount--;
+            
+            // 保存到文件
+            saveUsersToFile();
+            dataModified = true;
+            
+            printSuccess("用户删除成功！");
+            pauseSystem();
+            return;
+        }
+    }
+    
+    printError("用户不存在！");
+    pauseSystem();
+}
+
+/**
+ * @brief 修改用户密码
+ */
+void modifyUserPassword() {
+    clearScreen();
+    printHeader("修改用户密码");
+    
+    char username[MAX_USERNAME_LENGTH];
+    char newPassword[MAX_PASSWORD_LENGTH];
+    
+    printf("\n");
+    safeInputString("请输入用户名", username, MAX_USERNAME_LENGTH);
+    
+    // 查找用户
+    for (int i = 0; i < userCount; i++) {
+        if (strcmp(users[i].username, username) == 0) {
+            safeInputString("请输入新密码", newPassword, MAX_PASSWORD_LENGTH);
+            
+            strcpy(users[i].password, newPassword);
+            
+            // 保存到文件
+            saveUsersToFile();
+            dataModified = true;
+            
+            printSuccess("密码修改成功！");
+            pauseSystem();
+            return;
+        }
+    }
+    
+    printError("用户不存在！");
+    pauseSystem();
+}
+
+/**
+ * @brief 查看所有用户
+ */
+void viewAllUsers() {
+    clearScreen();
+    printHeader("所有用户列表");
+    
+    if (userCount == 0) {
+        printWarning("暂无用户数据！");
+        pauseSystem();
+        return;
+    }
+    
+    printf("\n");
+    printf("%-20s %-15s %-10s\n", "用户名", "用户类型", "状态");
+    printSeparator();
+    
+    for (int i = 0; i < userCount; i++) {
+        printf("%-20s %-15s %-10s\n", 
+               users[i].username,
+               users[i].isAdmin ? "管理员" : "普通用户",
+               strcmp(users[i].username, currentUser) == 0 ? "当前用户" : "");
+    }
+    
+    printf("\n总用户数: %d\n", userCount);
+    pauseSystem();
+}
\ No newline at end of file
diff --git a/user_manage.h b/user_manage.h
new file mode 100644
index 0000000..ce4a0f8
--- /dev/null
+++ b/user_manage.h
@@ -0,0 +1,13 @@
+#ifndef USER_MANAGE_H
+#define USER_MANAGE_H
+
+// 用户认证与管理相关函数
+int loginSystem();         // 处理用户登录
+void loadUsersFromFile();  // 从文件加载用户数据
+void saveUsersToFile();    // 将用户数据保存到文件
+void addUserAccount();     // 增加用户
+void deleteUserAccount();  // 删除用户
+void modifyUserPassword(); // 修改用户密码
+void viewAllUsers();       // 查看所有用户
+
+#endif // USER_MANAGE_H
\ No newline at end of file