在C中重新分配结构

#include <stdio.h>
#include <stdlib.h>

typedef struct {
    int *arr;
    int size;
} Array;

void reallocateArray(Array *arr, int size) {
    int newSize = size + 1;
    int *newArr = (int *) realloc(arr->arr, newSize * sizeof(int));
    if (newArr == NULL) {
        printf("Failed to allocate memory!
");
        exit(1);
    }
    arr->arr = newArr;
    arr->size = newSize;
}

int main() {
    Array arr;
    arr.arr = malloc(10 * sizeof(int));
    arr.size = 10;

    // 使用 reallocateArray 函数重新分配结构
    reallocateArray(&arr, 20);

    // 打印分配后的结构信息
    printf("Array size: %d
", arr.size);
    for (int i = 0; i < arr.size; i++) {
        printf("%d ", arr.arr[i]);
    }
    printf("\n");

    free(arr.arr);
    return 0;
}