Initial commit: C language learning code

翁凯C语言/12/可变数组的自动增长.c

@@ -0,0 +1,103 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+#include <stdbool.h>
+#include <string.h>
+#ifdef _WIN32
+#include <windows.h>
+#include <direct.h>
+#endif
+
+// !可变数组的自动增长
+/*
+    1.可变数组
+*/
+
+const BLOCK_SIZE = 20;
+
+typedef struct{
+    int *array;
+    int size;
+} Array;
+
+Array array_create(int init_size)
+{
+    Array a;
+    a.size = init_size;
+    a.array = (int *)malloc(sizeof(int) * a.size);
+    return a;
+}
+
+void array_free(Array *a)
+{
+    free(a->array);
+    a->array = NULL;
+    a->size = 0;
+}
+
+// 封装
+int array_size(const Array *a)
+{
+    return a->size;
+}
+
+int* array_at(Array *a, int index)
+{
+    if (index >= a->size)
+    {
+        array_inflate(a, (index/BLOCK_SIZE+1)*BLOCK_SIZE - a->size);
+    }
+    return &a->array[index];
+}
+
+int array_get(const Array *a, int index)
+{
+    return a->array[index];
+}
+
+void array_set(Array *a, int index, int value)
+{
+    a->array[index] = value;
+}
+
+void array_inflate(Array *a, int more_size)
+{
+    int *p = (int*)malloc(sizeof(int)*(a->size + more_size));
+    int i;
+    memccpy(p, a->array, sizeof(int)*a->size, a->size);
+    free(a->array);
+    a->array = p;
+    a->size =+ more_size;
+}
+
+int main()
+{
+    // 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
+
+    Array a = array_create(100);
+    printf("%d\n", array_size(&a));
+
+    *array_at(&a, 0) = 10;
+    printf("%d\n", *array_at(&a, 0));
+    int number;
+    int cnt = 0;
+    while(number!=-1)
+    {
+        scanf("%d", &number);
+        if (number!=-1)
+        {
+            *array_at(&a, cnt) = number;
+            cnt++;
+        }
+    }
+    array_free(&a);
+
+
+    return 0;
+}