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#include <iostream>
using namespace std;

// Function declaration
void swap(int& x, int& y);

int main ()
{
   // Local variable declaration
   int a = 100;
   int b = 200;

   cout << "Before swap, value of a :" << a << endl;
   cout << "Before swap, value of b :" << b << endl;

   /* Call the function to swap values */
   swap(a, b);

   cout << "After swap, value of a :" << a << endl;
   cout << "After swap, value of b :" << b << endl;

   return 0;
}

// Function definition
void swap(int& x, int& y)
{
   int temp;
   temp = x; /* Save the value at address x */
   x = y;    /* Put y into x */
   y = temp; /* Put x into y */

   return;
}

Before swap, value of a : 100
Before swap, value of b : 200
After swap, value of a : 200
After swap, value of b : 100