using System;

public class Program

{

    public static void Main()

    {

        do

        {

          Console.WriteLine("hello welcome to the calculator! if youd like to exit,type in exit");

          Console.WriteLine ("Input the first number to continue");

          String chose = Console.ReadLine();

            String chose1 = chose.ToLower();

          if(chose1 == "exit")

          {

            Console.WriteLine("you have exited the program");

            break;

​

          }

            else if(chose1 == "")

            {

            Console.WriteLine("You did not press anything");

            }       

          else

          {

             int firs = Convert.ToInt32(chose);

              Console.WriteLine("x = " + firs);

              Console.WriteLine("y = ");

             int secon = Convert.ToInt32(Console.ReadLine());

               Console.WriteLine("x = " +firs +" y = " +secon);

               Console.WriteLine(" press 1 for the sum, 2 for the difference 3 for the product and 4 for the quotient");

              int oper = Convert.ToInt32(Console.ReadLine());

              if(oper == 1) {

              int sum = firs+secon;

              Console.WriteLine("Result is {0}", sum );

              }

              else if (oper == 2){

                  int dif = firs-secon;

              Console.WriteLine("Result is {0}", dif );

              }

              else if (oper == 3){

                  int mult = firs*secon;

              Console.WriteLine("Result is {0}", mult);

              }

              else if (oper == 4){

                  int div = firs/secon;

              Console.WriteLine("Result is {0}", div );

              }

​

          }

​

       }

        while(true);

    }

}