//  File: ref6.C
//  
//  using references with const

#include <iostream.h>

int add(int &a, const int &b) {

   a = a + 1 ;
   return a + b ;
}

main() {
   int x = 3, y = 17, z = 0 ;

   cout << "Before: x = " << x << ", y = " << y << ", z = " << z << "\n" ;
   z = add(x,y) ;
   cout << "After: x = " << x << ", y = " << y << ", z = " << z << "\n" ;

   cout << "Before: x = " << x << ", y = " << y << ", z = " << z << "\n" ;
   z = add(x, 6) ;
   cout << "After: x = " << x << ", y = " << y << ", z = " << z << "\n" ;
}