using System;

​

public abstract class Animal 

{

    protected string Color { get; set; }

    protected bool IsFish { get; set; }

    public Animal(string color, bool isFish) {

        this.Color = color;

        this.IsFish = isFish;

    }

    public abstract void DisplayInformation();

}

​

public class Mouse : Animal {

    private float TailLength { get; set; }

    public Mouse(string color) :

        base(color, false) 

        {}

    public void SetTailLength(float length) {

        this.TailLength = length;   

    }

    public override void DisplayInformation() {

        Console.WriteLine(string.Format("This is a {0} mouse and it is{1} a fish. Its tail is {2} inches long.", this.Color, !this.IsFish ? " not" : string.Empty, this.TailLength));

    }

}

​

public class Goldfish : Animal {

    private int Age { get; set; }

    public Goldfish(string color) :

        base(color, true)

        {}

    public void SetAge(int age) {

        this.Age = age; 

    }

​

    public override void DisplayInformation() {

        Console.WriteLine(string.Format("This is a {0} goldfish and it is{1} a fish. It is {2} years old.", this.Color, !this.IsFish ? " not" : string.Empty, this.Age));

    }

}

​

// Create an instance of each animal above and print their information using the methods within each class class

// Output:

// This is a gray mouse and it is not a fish. Its tail is 4.5 inches long.

// This is a yellow goldfish and it is definitely a fish. It is 2 years old.

​

public class Program

{

    public static void Main()

    {

    }

}