using System;

interface IItem

{

    string name { get; set;}

    int goldValue { get; set;}

    void Equip ();

    void Sell ();

}

​

interface IDamagable

{

    int durability {get; set;}

    void TakeDamage (int _amount);

}

interface IPartOfQuest

{

    void TurnIn();

}

class Sword : IItem, IDamagable, IPartOfQuest

{

    public string name {get; set;}

    public int goldValue {get; set;}

    public int durability { get; set; }

    public Sword (string _name)

    {

        name = _name;

        goldValue = 100;

        durability = 30;

    }

    public void Equip ()

    {

        Console.WriteLine(name + " equiped");

    }

    public void Sell ()

    {

        Console.WriteLine(name + " sold for " + goldValue + " imaginary dollars.");

    }

    public void TakeDamage (int _dmg)

    {

        durability -= _dmg;

        Console.WriteLine(name + "damaged by " + _dmg + ". It now has a durability of " + durability);

    }

    public void TurnIn ()

    {

        Console.WriteLine(name + " turned in.");

    }

}

class Axe : IItem, IDamagable

{

    public string name {get; set;}

    public int goldValue {get; set;}

    public int durability { get; set; }

    public Axe (string _name)

    {

        name = _name;

        goldValue = 70;

        durability = 50;

    }

    public void Equip ()

    {

        Console.WriteLine(name + " equiped");

    }

    public void Sell ()

    {

        Console.WriteLine(name + " sold for " + goldValue + " imaginary dollars.");

    }

    public void TakeDamage (int _dmg)

    {

        durability -= _dmg;

        Console.WriteLine(name + "damaged by " + _dmg + ". It now has a durability of " + durability);

    }

}

public class Program

{

    public static void Main()

    {

        Sword sword = new Sword("Sword of Destiny");

        sword.Equip();

        sword.Sell();

        sword.TakeDamage(20);

        sword.TurnIn();

        Console.WriteLine();

        Axe axe = new Axe ("Furry Axe");

        axe.Equip ();

        axe.Sell ();

        axe.TakeDamage(10);

        IItem[] inventory = new IItem[2];

        inventory[0] = sword;

        inventory[1] = axe;

        Console.WriteLine();

        //loop through and turn in all quest items

        for (int i = 0; i < inventory.Length; i++)

        {

            IPartOfQuest questItem = inventory[i] as IPartOfQuest;

            if (questItem != null)

            {

                questItem.TurnIn();

            }

        }

    }

}