using System;

​

public delegate void StatHandler(int health, int mana);

​

public class Program

{

    public static void Main()

    {

        Player p = new Player();

        p.statChanged += UpdatePlayerUI;

        p.statChanged += UpdateEnemyUI;

        p.Health = 90;

        p.Mana = 75;

        p.Health = 15;

    }

    public static void UpdatePlayerUI(int health, int mana)

    {

        Console.WriteLine("---Player UI---");

        Console.WriteLine("Health: " + health);

        Console.WriteLine("Mana: " + mana);

    }

    public static void UpdateEnemyUI(int health, int mana)

    {

        Console.WriteLine("---Enemy UI---");

        Console.WriteLine("Player Health: " + health);

        Console.WriteLine("Player Mana: " + mana);

    }

}

​

public class Player

{

    private int health;

    private int mana;

    public int Health

    {

        get 

        {

            return health;  

        }

        set

        {

            health = value;

            OnStatChanged();

        }

    }

    public int Mana

    {

        get 

        {

            return mana;    

        }

        set

        {

            mana = value;

            OnStatChanged();

        }

    }

    public event StatHandler statChanged;

    public Player()

    {

        Health = 100;

        Mana = 100;

    }

    public void OnStatChanged()

    {

        if(statChanged != null)

        {

            statChanged(Health, Mana);  

        }

    }

}