#include <stdio.h>

int main(int argc, char *argv[])
{
  /* POINTER AS AN ADDRESS */
  int q = 10;
  int *p = &q;
  
  printf("address of q is %p\n", (void *)&q);
  printf("p contains %p\n", (void *)p);
  
  p = NULL;
  printf("NULL p now contains %p\n", (void *)p);
  return 0;
}