using System;

public class Program

{

    public static void Main()

    {

        string userChoice = "";

        Console.WriteLine("INTEGER CALCULATOR");

        Console.WriteLine("This program will add or subtract two integers.");

        Console.WriteLine();

        Console.WriteLine("Please Make a seclection.");

        Console.WriteLine("1 -Addition ");

        Console.WriteLine("2 -Subtraction");

        Console.WriteLine("3 -Exit ");

        userChoice = Console.ReadLine();

 switch (userChoice)

      {

          case "1" :

              Console.Clear();

              Add();

              break;

          case "2":

              Console.Clear();

              Subtract();

              break;

          default:

              Console.Clear();

              Console.WriteLine("Goodbye.");

            break;

 }

    }

        public static void Add()

        {

        }

        public static void Subtract ()

        {

        }

}

​