using System;

public class Program

{

  public static void Main()

  {

            Console.WriteLine("Welcome Calculator!");

            Console.WriteLine("Enter Your Fri Num: ");

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

            Console.WriteLine("Enter Your Sec Num: ");

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

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

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

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

            double output = 0;

            switch (obj)

            {

                case 1: 

                    output = fri + sec;

                    break;

                case 2:

                    output = fri - sec;

                    break;

                case 3:

                    output = fri * sec;

                    break;

                case 4:

                    output = fri / sec;

                    break;

                default:

                    Console.WriteLine("Invalid Option ");

                    break;

            }

​

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

            Console.WriteLine("{5} {5} {5} = {15}" , fri , obj , sec , output);

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

  }

}