using System;

using System.Collections.Generic;

​

public abstract class Animal : Pet

{

public string Name;

public int Age;

public bool female;

public string playful;

public override string ToString()

{

return "Animal: this is the default";

}

​

public string Playful

{

get

{

return playful;

}

​

set

{

playful = value;

}

}

​

public class Cat : Animal, Pet

{

public string breed;

public override string ToString()

{

return "Cat: a kitty is here";

}

}

​

public class Fish : Animal, Pet

{

public int SwimSpeed;

public override string ToString()

{

return "Fish: Smells fishy";

}

}

}

​

public class Zoo

{

public string Name;

public string City;

public int Capacity;

public List<Animal> Animals = new List<Animal>();

public Zoo(string nm, string cit, int cap)

{

Name = nm;

City = cit;

Capacity = cap;

}

​

public void addAnimal()

{

Animals.Add(new Animal.Fish());

}

​

public void removeAnimal()

{

Animals.RemoveAt(0);

}

​

public void printMethod(string ToString)

{

foreach (Animal a in Animals)

{

a.ToString();

}

}

}

​

interface Pet

{

string Playful

{

get;

set;

}

​

string ToString();

}

​

public class Program

{

public static void Main()

{

string nm = "National Zoo";

string cit = "Washington, D.C.";

int cap = 400;

Zoo myFavoriteZoo = new Zoo(nm, cit, cap);

Console.WriteLine("my Favorite Zoo's name is: " + myFavoriteZoo.Name);

Console.WriteLine("My Favorite Zoo's location is: " + myFavoriteZoo.City);

Console.WriteLine("My Favorite Zoo's capacity is: " + myFavoriteZoo.Capacity);

Animal a1 = new Animal.Cat();

a1.Name = "Tiger";

Animal a2 = new Animal.Fish();

a2.Name = "Angelfish";

Console.WriteLine("\n");

Console.WriteLine("Tiger and Angelfish have been added to the Zoo");

Console.WriteLine("\n");

Console.WriteLine("These are the animals in the Zoo: ");

List<Animal> Animals;

int p = 0;

foreach (string j in Animals)

{

Console.WriteLine(j);

p++;

}

Animals.RemoveAt(0);

Console.WriteLine("\n");

Console.WriteLine("The first animal from the Zoo has been removed. The current animals are: ");

int p1 = 0;

foreach (string m in Animals)

{

Console.WriteLine(m);

p1++;

}

}

}