Swap three number without fourth variable

Swap three number without fourth variable

using System;

namespace ConsoleApplicationSample

{

    class SwapNumber

    {

        public static void Main()

        {//Swap three number without fourth variable

            int a, b, c;

            a = 10;

            b = 20;

            c = 30;

            c = a + b + c;

            a = c - (a + b);

            b = c - (a + b);

            c = c - (a + b);

            Console.Write("a= " + a + " b= " + b + " c= " + c);

            Console.ReadLine();

        }

    }

}

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