#include <iostream>
using namespace std;

int& max(int& m, int& n)  // return type is reference to int
{
  return (m > n ? m : n); // return type is reference to int
}


int main()
{
  int m = 44, n = 22;
  cout << m << ", " << n << ", " << max(m,n) << endl;
  max(m,n) = 55;   // changes the value of m from 44 to 55
  cout << m << ", " << n << ", " << max(m,n) << endl;
  return 0;
}