// Use of a pointer variable
#include <iostream>
using namespace std;

int main(){
  int   n = 25;
  cout << "n   = " << n << '\n' << "&n  = " << &n << endl;

  int *pn = &n;  // pn holds the address of n

  cout << "pn  = " << pn << '\n' << "&pn = " << &pn << endl;

  return 0;
}