// Swap in c++

// Compile with g++ -o swaptest swaptest.cpp

#include <iostream>
using namespace std;

// Pass the params by reference
void swap(int &x, int &y)
{
    int t = x;    // Automatic dereference
    x = y;
    y = t;
}

int main()
{
    cout << "C++ by reference" << endl; 
   int a = 1;
   int b = 2;

   cout << a << b <<  endl;

   swap(a, b);          // Address of param is passed

   cout << a << b <<  endl;
}