#include <stdlib.h>

int main(int argc, char **argv)
{
    void *ptr = NULL;
    ptr = realloc(ptr, 0);
    printf("realloc(NULL, 0)  --  pointer = %p\n", ptr);
    
    ptr = malloc(0);
    printf("malloc(0)  --  pointer = %p\n", ptr);
    return 0;
}

