Initial commit: C language learning code

2025-07-20 16:30:56 +08:00
commit 06e24173a6
139 changed files with 9303 additions and 0 deletions
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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+#include <stdbool.h>
+#include <string.h>
+
+// !结构与函数
+/*
+	1.结构作为函数参数
+	  int numberofDays(struct date d)
+	  整个结构可以作为参数的值传入函数
+	  这时候是在函数内新建一个结构变量，并复制调用者的结构的值
+	  也可以返回一个结构
+	  这与数组完全不同
+*/
+
+struct data
+{
+	int month;
+	int day;
+	int year;
+};
+
+bool isLeap(struct data d);
+int numberOfDays(struct data d);
+
+int main(void)
+{
+	struct data today, tomorrow;
+
+	printf("Enter today's date (mm dd yyyy): ");
+	scanf("%i %i %i", &today.month, &today.day, &today.year);
+
+	if (today.day != numberOfDays(today))
+	{
+		tomorrow.day = today.day + 1;
+		tomorrow.month = today.month;
+		tomorrow.year = today.year;
+	}
+	else if (today.month == 12)
+	{
+		tomorrow.day = 1;
+		tomorrow.month = 1;
+		tomorrow.year = today.year + 1;
+	}
+	else
+	{
+		tomorrow.day = 1;
+		tomorrow.month = today.month + 1;
+		tomorrow.year = today.year;
+	}
+
+	printf("Tomorrow's date is %i-%i-%i.\n", tomorrow.month, tomorrow.day, tomorrow.year);
+
+	return 0;
+}
+
+bool isLeap(struct data d)
+{
+	bool leap = false;
+
+	if ((d.year % 4 == 0 && d.year % 100 != 0) || d.year % 400 == 0)
+	{
+		leap = true;
+	}
+
+	return leap;
+}
+
+int numberOfDays(struct data d)
+{
+	int days;
+	const int daysPerMonth[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+	
+	if (d.month == 2 && isLeap(d))
+	{
+		days = 29;
+	}
+	else
+	{
+		days = daysPerMonth[d.month - 1];
+	}
+
+	return days;
+}