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jack
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I have a piece of code that I don't understand why it works can someone help?
jack
Member
in Programming
The piece is from his "14. How to program in C# - INTERFACES - Tutorial". As I said, I don't understand why it works, can someone please explain.
for (int i = 0; i < inventory.Length; i++)
{
IPartOfQuest questItem = inventory[i] as IPartOfQuest;
if(questItem != null)
{
questItem.TurnIn();
}
}
Here is the whole program:
using System;
using System.Collections.Generic;
namespace FirstConsoleProject
{
class MainClass
{
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; }
// CONSTRUCTOR
public Sword(string _name)
{
name = _name;
goldValue = 100;
durability = 30;
}
public void Equip()
{
Console.WriteLine(name + " equipped.");
}
public void Sell()
{
Console.WriteLine(name + " sold for " + goldValue + "g.");
}
public void TakeDamage(int _dmg)
{
durability -= _dmg;
Console.WriteLine(name + " took " + _dmg + " damage; It now has " + durability + " durability.");
}
public void TurnIn()
{
Console.WriteLine(name + " has been turned in.");
}
}
class Axe : IItem, IDamagable
{
public string name { get; set; }
public int goldValue { get; set; }
public int durability { get; set; }
// CONSTRUCTOR
public Axe(string _name)
{
name = _name;
goldValue = 70;
durability = 50;
}
public void Equip()
{
Console.WriteLine(name + " equipped.");
}
public void Sell()
{
Console.WriteLine(name + " sold for " + goldValue + "g.");
}
public void TakeDamage(int _dmg)
{
durability -= _dmg;
Console.WriteLine(name + " took " + _dmg + " damage; It now has " + durability + " durability.");
}
}
public static void Main(string[] args)
{
Sword sword = new Sword("Sword Of Destiny");
sword.Equip();
sword.TakeDamage(20);
sword.Sell();
Console.WriteLine();
Console.WriteLine();
Axe axe = new Axe("Axemolyum");
axe.Equip();
axe.TakeDamage(10);
axe.Sell();
Console.WriteLine();
// Create Inventory
IItem[] inventory = new IItem[2];
inventory[0] = sword;
inventory[1] = axe;
for (int i = 0; i < inventory.Length; i++)
{
IPartOfQuest questItem = inventory[i] as IPartOfQuest;
if(questItem != null)
{
questItem.TurnIn();
}
}
}
}
}