using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

abstract class Bok

{

    public string boktyp;

    public int year;

    public string titel;

    public string skribent;

    //public string hylla;

​

    protected Bok(int yearet, string titeln, string skribenten)     //Samtliga underklasser använder denna konstruktorkod

    {

        this.year = yearet;

        this.titel = titeln;

        this.skribent = skribenten;

    }

​

    protected virtual string ToString()

    {

        return String.Format(" {0,-30} {1,-15} {2,30}", this.titel, this.skribent, this.year);

    }

​

}

​

​

class Facklitt : Bok

{

    public Facklitt(int yearet, string titeln, string skribenten) : base(yearet, titeln, skribenten)

    {

        this.boktyp = "Facklitteratur";

        //this.hylla = "F";

    }

​

    protected override string ToString()

    {

        return base.ToString() + "\n Facklitteratur finns i hylla F\n";

        //return String.Format(" {0,-30} {1,-15} {2,30}", this.titel, this.skribent, this.year);

    }

}