// Swap
// Demonstrates passing references 
// to alter argument variables

#include <iostream>
using namespace std;

void badSwap(int x, int y);
void goodSwap(int& x, int& y);

int main()
{
   int myScore = 150;
   int yourScore = 1000;

   cout << "Original values\n";
   cout << "myScore: " << myScore << "\n";
   cout << "yourScore: " << yourScore << "\n\n";

   cout << "Calling badSwap()\n";
   badSwap(myScore, yourScore);
   cout << "myScore: " << myScore << "\n";
   cout << "yourScore: " << yourScore << "\n\n";

   cout << "Calling goodSwap()\n";
   goodSwap(myScore, yourScore);
   cout << "myScore: " << myScore << "\n";
   cout << "yourScore: " << yourScore << "\n";
   return 0;
}

void badSwap(int x, int y)
{
   int temp = x;
   x = y;
   y = temp;
}

void goodSwap(int& x, int& y)
{
   int temp = x;
   x = y;
   y = temp;
}