//  File: ref4.C
//  
//  using references

#include <iostream.h>

int& max(int &a, int &b) { // returns a reference
  
   if (a > b) return a ;
   return b ;
}

main() {
   int x = 3, y = 17 ;

   cout << "x = " << x << ", y = " << y << "\n" ;

   max(x,y) = 2 ;

   cout << "x = " << x << ", y = " << y << "\n" ;

   max(x,y) = 1 ;

   cout << "x = " << x << ", y = " << y << "\n" ;
}