using System;

public class Program

    {

        public static void Main(string[] args)

        {

            int num1;

            int num2;

            string operand;

            float answer;

            Console.Write(" شماره 1 را وارد کنید: ");

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

            Console.Write("لطفا یک عملوند وارد کنید (+, -, /, *): ");

            operand = Console.ReadLine();

            Console.Write("شماره 2 را وارد کنید: ");

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

            switch (operand)

            {

                case "-":

                    answer = num1 - num2;

                    break;

                case "+":

                    answer = num1 + num2;

                    break;

                case "/":

                    answer = num1 / num2;

                    break;

                case "*":

                    answer = num1 * num2;

                    break;

                default:

                    answer = 0;

                    break;

            }

            Console.Write("پاسخ است : ");

            Console.Write(answer);

        }

}