using System;

public class Game

{

    public static void Main()

    {

        Character c = new Character();

        UI ui = new UI ();

        Camera camera = new Camera ();

        c.AddOnHitListener(ui.UpdateHealthBar);

        c.AddOnHitListener(camera.ShakeCamera);

        c.Damage (50);

    }

}

​

public class Character {

    public delegate void OnHitDelegate (int damage);

    public OnHitDelegate OnHit;

    public int health = 100;

    public void Damage (int damage) {

        health -= damage;

        OnHit.Invoke(damage);

    }

    public void AddOnHitListener (OnHitDelegate listener) {

        OnHit += listener;

    }

    public void RemoveOnHitListener (OnHitDelegate listener) {

        OnHit -= listener;

    }

}

​

public class UI {

    public void UpdateHealthBar (int damage) {

        Console.WriteLine ("Updating health bar");

    }

}

​

public class Camera {

    public void ShakeCamera (int damage) {

        Console.WriteLine ("Shaking camera");

    }

}