#include <stdio.h>


int main()
{
  int num1;
  int *ptr1 = &num1, *ptr2;
  num1 = 7;
  printf("size of num1: %d\n",sizeof(num1));
  printf("value of num1: %d\n",num1);
  printf("address of num1: 0x%p\n",&num1);
  printf("address in ptr1: 0x%p\n",ptr1);
  printf("ptr1 == &num1?: %d\n",(ptr1==&num1));
  printf("address in ptr2: 0x%p\n",ptr2);
  printf("does ptr2==NULL? ");
  ptr2==NULL ? printf("Yes it does\n") : printf("No it doesn't\n");

  return 0;
}