using System;

​

public abstract class EnemyShip{

    private string name;

    private int damage;

    protected string ModifyName{

        get {return name;}

        set {name=value;}

    }

    protected int ModifyDamage{

        get {return damage;}

        set {damage = value;}

    }

    public void Print(){

        Console.WriteLine("{0} is on the screen", ModifyName);

    }

    public void Follow(){

        Console.WriteLine("{0} is following",ModifyName);

    }

    public void Attack(){

        Console.WriteLine("{0} is attacking with damage {1}",ModifyName,ModifyDamage);

    }

}

​

public class UFOShip:EnemyShip{

    public UFOShip(){

        ModifyName="UFOShip";

        ModifyDamage=20;

    }

}

​

public class RocketShip:EnemyShip{

    public RocketShip(){

        ModifyName="RocketShip";

        ModifyDamage=30;

    }

}

​

public class EnemyFactory:EnemyShip{

    public static EnemyShip Create(int type){

        if (type==1)

            return new UFOShip();

    else 

            return new RocketShip();

    }

}

public class Program

{

    public static void Main()

    {

        EnemyShip enemy = EnemyFactory.Create(2);

        dosomestuff(enemy);

    }

    public static void dosomestuff(EnemyShip m){

        m.Print();

        m.Follow();

        m.Attack();

    }

}