using System;

public class Program

{

    public static void Main()

    {

        int a=10,b=20;

​

            //swapping

            a=a+b;

            b=a-b;

            a=a-b;

            Console.WriteLine("Values after swapping are:");

            Console.WriteLine("a="+a);

            Console.WriteLine("b="+b);

    }

}