#include <iostream>

using namespace std;

void order(int & x, int & y)   /* ampersand before variable name
                                  means it is a reference parameter.
                                  not a copy of the original value,
                                  but a redirection to the original
                                  variable */
{ cout << "2 x = " << x << "\n";
  cout << "2 y = " << y << "\n"; 
  if (x > y)
  { int t = x;
    cout << "swapping\n";
    x = y;
    y = t; }
  cout << "3 x = " << x << "\n";
  cout << "3 y = " << y << "\n"; }

int main()
{ int a, b;
  cout << "enter the values ";
  cin >> a >> b;
  cout << "1 a = " << a << "\n";
  cout << "1 b = " << b << "\n";
  order(a, b);
  cout << "4 a = " << a << "\n";
  cout << "4 b = " << b << "\n"; }