using System;

public class Program

{

    public static void Main()

    {

            Console.WriteLine("enter two numbers and a Symbol");

            Console.WriteLine("First number:");

                int number1 = int.Parse(Console.ReadLine());

​

            Console.WriteLine("Second number:");

                int number2 = int.Parse(Console.ReadLine());

​

            Console.WriteLine("Mathematical Sign (*,/,+,-):");

            Console.WriteLine("      or");

        Console.WriteLine("Press Q to quit");

                string number3 = Console.ReadLine();

​

         int res = number1 * number2;

​

        int res1 = number1 / number2;

​

        int res2 = number1 + number2;

​

        int res3 = number1 - number2;   

​

        bool exit = false;

 while (! exit) // IF NOT EXIT 

​

        switch (number3)

                {

                case "*":

                    Console.WriteLine("{0} {1} {3} = {2}", number1,number3 ,res,number2);

                        break;

               case "/":

                  Console.WriteLine("{0} {1} {3} = {2}", number1,number3 ,res1,number2);   

                break;

                    case "+":

                  Console.WriteLine("{0} {1} {3} = {2}", number1,number3 ,res2,number2);

                break;

                case "-":

                  Console.WriteLine("{0} {1} {3} = {2}", number1,number3 ,res3,number2);

                break;

            case "Q": // while you press q

                exit = true; // exit become true

                break;

​

           }

    }

}

​

​