using System;

​

//base class

​

class Room

{

    public virtual string Info()

    {

        return " ";

    }

}

​

​

//derived class

​

class Alpha : Room

{

    public string grouping;

    public Alpha(string g)

    {

        grouping = g;

    }

    public string results;

    public override string Info()

    {

        switch(grouping.ToUpper())

        {

        case "A":

        results="You are in Room 1.";

        break;

        case "B":

        results="You are in Room 2.";

        break;

        default:

        results="It is an invalid entry.";

        break;

        }

        return results;

    }

}

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("What's your group? ");

        string grouping = Console.ReadLine();

        Room alpha = new Alpha(grouping);

        Console.WriteLine(alpha.Info());

    }

}