📒 笔记文档

分配什么长度的内存多少个。并且初始化。

• 分配数组

int *a = calloc(8, sizeof(int));
if(a){
    for (size_t i = 0; i < n; i++) {
    	printf("a[%zu]=%d\n", i, a[i]);
	}
}

• 分配结构体

typedef struct Point {
    int x;
    int y;
} Point_t;
Point_t *points = calloc(3, sizeof(Point_t));
if (!points) {
    perror("calloc");
    return 1;
}
//赋值
points[0].x = 5;
points[0].y = 10;
for (size_t i = 0; i < n; i++) {
	printf("points[%zu]=(%d, %d)\n", i, points[i].x, points[i].y);
}