// File: ref2.cpp
//
// Passing references as parameters.

#include <iostream>
using namespace std;

void swap (int &x, int &y) {
    int temp ;

    temp = x ;
    x = y ;
    y = temp ;
}


int main() {
   int n, m ;

   n = 3 ;
   m = 17 ;

   cout << "n = " << n << ", m = " << m << endl ;

   swap(n, m) ;

   cout << "n = " << n << ", m = " << m << endl ;

}