// The memory address of a variable and its alias
#include <iostream>
using namespace std;

int main(){
  int n = 25;  // the target
  int& r = n;  // the alias of the target

  cout << "n and r   = " << n << '\t' << r << endl;

  n = 40;
  cout << "&n and &r = " << &n << '\t' << &r << endl;

  return 0;
}