using System;

​

public class Program

{

    public static void Main()

    {

            Console.Write("input number");

            num1 = Convert.ToInt32(Console.ReadLine());

​

            Console.Write("input: +, -, /, *, %");

            char op = Convert.ToChar(Console.ReadLine());

​

            Console.Write("input number");

            num2 = Convert.ToInt32(Console.ReadLine());

            switch (op)

​

            {

​

                case "+":

​

                    answer = num1 + num2;

​

                    break;

​

                case "-":

​

                    answer = num1 - num2;

​

                    break;

​

                case "/":

​

                    answer = num1 / num2;

​

                    break;

​

                case "*":

​

                    answer = num1 * num2;

​

                    break;                              // never bothered with modulo since this doesnt even work

​

             }

​

​

    }

 }