//  File: ref1.cpp
//  
//  using references

#include <iostream>
using namespace std ;

main() {
   int x = 3, y = 9 ;
   int& ref = x ; // initialize reference

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

   x = 5 ;
   cout << "x = " << x << ", ref = " << ref << "\n" ; 

   ref = 7 ;
   cout << "x = " << x << ", ref = " << ref << "\n" ; 

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