swapping of two values by call by value.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace callByValue

{

    class Program

    {

       public static void swap(int a, int b)

       {

           a = a + b;

           b = a - b;

           a = a - b;

           Console.WriteLine("after swapping value of a {0} and b {1}",a,b);

       }

       static void Main(string[] args)

       {

           int c=10, d=20;

           Console.WriteLine("before swapping  value of a {0} and b is{1}",c,d);

           

              swap(c,d);

             

           

       }

    }

}