using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        MyPets pets = new MyPets();

        pets.addPet(new Cat("Bob", 2, Mood.Surly));

        pets.addPet(new Terrier("Jack", 17, Mood.Surly));

        pets.addPet(new SheepDog("Bubba", 2, Mood.Happy));

        pets.itterate();

    }

}

​

public class Visitor

{

    public void doItterate(Cat c)

    {

        Console.WriteLine(c.ToString());

        c.makeNoise();

        c.climbTree();

    }

​

    public void doItterate(Dog d)

    {

        Console.WriteLine(d.ToString());

        d.makeNoise();

    }

}

​

public abstract class Pet

{

    public Pet(string name, int age, Mood mood)

    {

        this.MoodOfPet = mood;

        this.Name = name;

        this.Age = age;

    }

​

    public string Name

    {

        get;

        private set;

    }

​

    public int Age

    {

        get;

        private set;

    }

​

    public Mood MoodOfPet

    {

        get;

        private set;

    }

​

    public abstract void makeNoise();

    public override string ToString()

    {

        return this.Name + " is " + this.Age + " years old  and feels " + this.MoodOfPet;

    }

​

    public abstract void accept(Visitor v);

}

​

public enum Mood

{

    Surly,

    Happy

}

​

public abstract class Dog : Pet

{

    public Dog(string name, int age, Mood mood): base (name, age, mood)

    {

    }

​

    public override void makeNoise()

    {

        Console.WriteLine(this.Name + " is woofing");

    }

​

    public override void accept(Visitor v)

    {

        v.doItterate(this);

    }

}

​

public class SheepDog : Dog

{

    public SheepDog(string name, int age, Mood mood): base (name, age, mood)

    {

    }

}

​

public class Cat : Pet

{

    public Cat(string name, int age, Mood mood): base (name, age, mood)

    {

    }

​

    public void climbTree()

    {

        Console.WriteLine(this.Name + " is climbing");

    }

​

    public override void makeNoise()

    {

        Console.WriteLine(this.Name + " is meowing");

    }

​

    public override void accept(Visitor v)

    {

        v.doItterate(this);

    }

}

​

public class Terrier : Dog

{

    public Terrier(string name, int age, Mood mood): base (name, age, mood)

    {

    }

​

    public void growl()

    {

        Console.WriteLine(this.Name + " is growling");

    }

​

    public override void makeNoise()

    {

        growl();

    }

}

​

public class MyPets

{

    private Visitor visitor = new Visitor();

    public MyPets()

    {

        Pets = new List<Pet>();

    }

​

    public List<Pet> Pets

    {

        get;

        private set;

    }

​

    public void addPet(Pet p)

    {

        Pets.Add(p);

    }

​

    public void itterate()

    {

        foreach (Pet p in Pets)

        {

            p.accept(visitor);

        }

    }

}