using System;

public class Program

{

    public static void Main()

    {

            Console.WriteLine("Welcome to Calculator!");

            Console.WriteLine("Enter Your Frist Number: ");

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

            Console.WriteLine("Enter Your Second Number: ");

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

            Console.WriteLine("Choose One Of The Following Operations : ");

            Console.WriteLine("1- Addition \n2- Subtraction \n3-Multiplication \n4-Division");

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

            double output = 0;

            switch (Op)

            {

                case 1: 

                    output = frist + second;

                    break;

                case 2:

                    output = frist - second;

                    break;

                case 3:

                    output = frist * second;

                    break;

                case 4:

                    output = frist / second;

                    break;

                default:

                    Console.WriteLine("Invalid Option ");

                    break;

            }

​

            Console.WriteLine("Your Oreation Is :");

            Console.WriteLine("{0} {1} {2} = {3}" , frist , Op , second , output);

            Console.WriteLine("Thannk You For Using Our Calculato :) , Press Any Key To End The Program.");

    }

}