int main()
{
  int var;     // Define an integer variable var
  int *p;      // Define a pointer to an integer
  p = &var;    // Extract the address of var
  var = 421;   // Change content of var
  printf("Address of integer variable var : %p\n", &var);
  printf("Its value: %d\n", var);  // 421
  printf("Value of integer pointer p : %p\n", p);  // = &var
  // The content of the variable pointed to by p is *p
  printf("The value p points at :  %d\n", *p);
  // Address where the pointer is stored in memory
  printf("Address of the pointer p : %p\n", &p);
  return 0;
}