C语言内存分配函数对比

#include <stdio.h>
#include <stdlib.h>
//malloc realloc ca
void test01()
{
    //只会开辟内存
    int * p = (int *)malloc(sizeof(int) * 10);
    for (int i = 0; i < 10; ++i)
    {
        p[i] = i;
    }
    printf("&P:%d\n", p);
    //后续空间不够大就会开辟新的内存
    p = (int *)realloc(p, sizeof(int) * 1000);
    for (int i = 0; i < 10; ++i)
    {
        p[i] = i;
    }
    printf("&P:%d\n", p);
    if (p != NULL)
    {
        free(p);
        p = NULL;
    }
}
void test02()
{
    //会初始化为0
    int * p = (int *)calloc(10, sizeof(int));
    for (int i = 0; i < 10; ++i)
    {
        printf("%d\n", p[i]);
    }
}

void main()
{
    //test01();
    test02();
    system("pause");
}