Supplementary realloc and calloc dynamic memory allocation functions

malloc calloc realloc is <stdilb.h> function header file
function prototype:
void the malloc (num_bytes unsigned int)
void calloc (n-size_t, size_t size)
void realloc (PTR void *, size_t new_size)

Let me talk about the difference between malloc and calloc
space malloc allocation of rubbish in value, while calloc full of 0
but the efficiency malloc calloc higher than

# include <stdio.h>
# include <malloc.h>
int main()
{
    int* p;
    int* pp;
    p = (int*)malloc(10 * sizeof(int));
    pp = (int*)calloc(10 ,sizeof(int));
    printf("malloc的存储空间：\n");
    for (int i = 0; i < 10; i++)
    {
        printf("%d ", *(p+i));
    }
    printf("\n");
    printf("calloc的存储空间：\n");
    for (int i = 0; i < 10; i++)
    {
        printf("%d ", *(pp+i));
    }
    printf("\n");
    return 0;
}