/**
 * swap.cpp       
 * 19-mar-2007/sklar
 *
 * demonstrates the use of functions that use reference parameters 
 * see chapter 5 in the jones/harrow textbook
 *
 */

#include <iostream>
using namespace std;


// Function prototypes

void swap( int &a, int &b );
void notswap( int a, int b );


// Main program

int main() 
{
  int x = 5;
  int y = 7;
  
  cout << "Before swap: x = " << x << " y = " << y << endl;
  swap( x, y );
  cout << "after swap: x = " << x << " y = " << y << endl;
} 

// Declare function swap(), using reference parameters
// This one swaps the variable values.

void swap( int &a, int &b ) 
{
  int tmp;
  tmp = a;
  a = b;
  b = tmp;
  return;
}


// Declare function notswap()
// This does not swap the values.

void notswap( int a, int b ) 
{
  int tmp;
  tmp = a;
  a = b;
  b = tmp;
  return;
}