using System;

​

public class Program

{

    public static void Main()

    {

        double a, b, rpt = 1;

        int choice;

        while (rpt != 5)

        {

            Console.WriteLine("Select the operation");

            Console.WriteLine("1 . Addition");

            Console.WriteLine("2 . Subtraction");

            Console.WriteLine("3 . Multiplication");

            Console.WriteLine("4 . Division");

            Console.WriteLine("5 . Exit");

            Console.WriteLine("Enter ur choice :");

            choice = int.Parse(Console.ReadLine());

            switch (choice)

            {

                case 1:

                    Console.WriteLine("Enter two numbers:");

                    a = double.Parse(Console.ReadLine());

                    b = double.Parse(Console.ReadLine());

                    Console.WriteLine("Result of Addition : "+(a+b));break;

                case 2:

                    Console.WriteLine("Enter two numbers:");

                    a = double.Parse(Console.ReadLine());

                    b = double.Parse(Console.ReadLine());

                    Console.WriteLine("Result of Subtraction: "+(a-b));break;

                case 3:

                    Console.WriteLine("Enter two numbers:");

                    a = double.Parse(Console.ReadLine());

                    b = double.Parse(Console.ReadLine());

                    Console.WriteLine("Result of Multiplication: "+(a*b));break;

                case 4:

                    Console.WriteLine("Enter two numbers:");

                    a = double.Parse(Console.ReadLine());

                    b = double.Parse(Console.ReadLine());

                    if (b == 0)

                    {

                        Console.WriteLine("Division not possible ");

                    }

                    else

                    {

                        Console.WriteLine("Result of Division : "+(a/b));

                    }

​

                    break;

                case 5:

                    rpt = 5;

                    break;

                default:

                    Console.WriteLine("Invalid selection");

                    break;

            }

        }

    }

}