using System;

public class Program

{

    static string operation; 

    static int  firstNum; 

    static int secondNum;

    static int answer;

​

​

    static void GetValue()

    {

         Console.WriteLine("This is a basic calculator!");

​

                Console.Write("Enter the first number: ");

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

​

                Console.Write("Enter your second number: ");

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

                Console.Write("Enter your operation ( x , / , +, -): ");

                operation = Console.ReadLine();

                Console.WriteLine();

                Console.WriteLine("Results");

​

    }

        public static void Main(String[] args)

        {

            GetValue();

            if (operation == "x")

                {

                   answer = firstNum * secondNum;

                }

                else if (operation == "/")

                {

                   answer = firstNum / secondNum;

                }                                                                           

                else if (operation == "+")

                {

                   answer = firstNum + secondNum;

                }

                else if (operation == "-")

                {

                   answer = firstNum - secondNum;

                }

            DisplayResult();

        }

    static void DisplayResult()

    {

        if  (operation == "x")

        {

         Console.WriteLine(firstNum + " x " + secondNum + " = " + answer);

         Console.ReadLine();

        }

        else if (operation == "/")

        {

        Console.WriteLine(firstNum + " / " + secondNum + " = " + answer);

        Console.ReadLine();

        }

        else if  (operation == "+")

        {

        Console.WriteLine(firstNum + " + " + secondNum + " = " + answer);

        Console.ReadLine();

        }

        else if (operation == "-")

        {

        Console.WriteLine(firstNum + " - " + secondNum + " = " + answer);

        Console.ReadLine();

        }

        else

        {

        Console.WriteLine("Sorry that is not correct format! Please restart!");     

        Console.ReadLine();

        }

    }

}