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

int main() {
    int *p = (int *) malloc(sizeof(int));
    *p = 1;
    printf("*p = %d, p = %p, &p = %p\n", *p, p, &p);
    free(p);
    printf("*p = %d, p = %p, &p = %p\n", *p, p, &p);
    p = NULL;
    printf("p = %p, &p = %p\n", p, &p);
    //printing *p here will give seg-fault
    return 0;
}