swapping two variables without using temp/third variable and using temp/third variable in C#.NET

 In many of interviews, interviewers will ask write a program to swap two numbers without using a third variable or temporary (temp) variable. So in this snippet we will see how to swap two numbers with/without using third variable.

Program : Swapping 2 numbers With temp variable

class SwapTwoNumbersUsingTempVariable     {         public static void Main()         {             Console.WriteLine("/****** Program to swap 2 numbers using temporary variable *******/");             int a = 10, b = 20;             Console.WriteLine(" Values before swapping a={0} , b={1}", a, b);                        int tempVar = 0; //temporary variable             tempVar = a;             a = b;             b = tempVar;             Console.WriteLine(" Values after swapping a={0} , b={1}", a, b);             Console.ReadKey();         }     }

Output:  Swap 2 numbers using temp/third variable

Program : Swapping 2 numbers Without temp variable

class SwapTwoNumbersWithoutUsingThirdVariable     {         public static void Main()         {             Console.WriteLine("/****** Program to swap 2 numbers without using temporary variable *******/");             int a = 10, b = 20;             Console.WriteLine(" Values before swapping a={0} , b={1}", a, b);             a = a + b;             b = a - b;             a = a - b;             Console.WriteLine(" Values after swapping a={0} , b={1}", a, b);             Console.ReadKey();         }     }

Output: Swap 2 numbers without using temp/third variable