#include <iostream>  // cout, endl
#include <cstdlib>   // EXIT_SUCCESS

using std::cout;
using std::endl;

int main(int argc, char** argv) {
  int x = 5, y = 10;
  int& z = x;  // binds the name "z" to variable x

  z += 1;  // sets z (and thus x) to 6
  x += 1;  // sets x (and thus z) to 7

  z = y;   // sets z (and thus x) to 10 (the value of y)
  z += 1;  // sets z (and thus x) to 11

  cout << "x: " << x << "; y: " << y << "; z: " << z << endl;
  return EXIT_SUCCESS;
}