#include <iostream.h>

// Sample program to show the difference between reference
// and value parameters.

void happy(int k);    // value ==> won't affect calling arg
void joy(int& j);     // reference ==> might affect calling arg

main()
{
   int x=1;
   cout << "First with happy:\n";
   cout << "  BEFORE:  x = " << x << endl;
   happy(x);
   cout << "  AFTER:   x = " << x << endl;

   cout << "Now with joy:\n";
   cout << "  BEFORE:  x = " << x << endl;
   joy(x);
   cout << "  AFTER:   x = " << x << endl;
}

void happy(int k)
{
   k = 500;
}

void joy(int& j)
{
   j = 500;
}