using System;

public class Program

{

    public static void Main()

    {

String BirthMonthAsString;

int BirthMonth;

        Console.WriteLine("Please enter a birth month as a number");

        BirthMonthAsString = Console.ReadLine();

        BirthMonth = Convert.ToInt32(BirthMonthAsString);

        if(BirthMonth <1 || BirthMonth > 12) 

           Console.WriteLine("error, please run again and enter a valid month as a number.");

        else

            Console.WriteLine(BirthMonth+ " is a valid birth month");

        /*I used integers instead of doubles here so you cannot enter a number that is not whole. If you enter a number that is not whole it will spit out a formating

        instead of the error I want. I could solve this by saying:

        if(BirthMonth == 1 || BirthMonth == 2 ... ||BirthMonth == 12)

        or in python I believe there is a way to detect a format error and run seporate code based on that. I do not know if such a thing exists in C#.*/

    }

}