Swapping of variables without Third Variable using XOR Logic

In this example we used A = 4 means in binary it is 00100

and B = 6 means in binary it is 00110.

In Programming it is used like this,

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace SwapValue

{

class Program

{

static void Main(string[] args)

{

Console.WriteLine("Swapping of value using XOR");

Console.Write("Enter First Value - ");

var a = Convert.ToInt64(Console.ReadLine());

Console.Write("Enter Second Value - ");

var b = Convert.ToInt64(Console.ReadLine());

Console.WriteLine("Values Before Swap A = {0} and B = {1}", a, b);

a = a ^ b;

b = a ^ b;

a = a ^ b;

Console.WriteLine("Values After Swap A = {0} and B = {1}", a, b);

Console.ReadKey();

}

}

}

Output

Let us discuss how it works,

(1) a = a ^ b

A = 4 means 00100

B = 6 means 00110 now apply Ex-OR gate add this two binary values

when we add this binary values using first table ans is 00010 in binary and in decimal is a = 2.

(2) b = a ^ b

A = 2 means 00010 and B = 6 means 00110 now apply Ex-OR gate add this two binary values

when we add this binary values using first table ans is 00100 in binary and in decimal is b = 4.

(3) a = a ^ b

A = 2 means 00010 and B = 4 means 00100 now apply Ex-OR gate add this two binary values

when we add this binary values using first table ans is 01100 in binary and in decimal is a = 6.

In this way you can swap two values without third variable. I hope you find this blog useful. Thanks for reading.