using System;
public class Lottery{
private static Random rdm = new Random(unchecked((int)DateTime.Now.Ticks));
private int difficulty;
private readonly int winningNumber;
private readonly decimal amountWon;
private static Lottery uniqueInstance = null;
private Lottery(int difficulty){
this.difficulty = difficulty;
this.winningNumber = rdm.Next(difficulty);
this.amountWon = 500000.00M;
}
public static Lottery Instance(int difficulty){
if (uniqueInstance == null)
uniqueInstance = new Lottery(difficulty);
return uniqueInstance;
}
public int DrawLotteryNumber{
get {return rdm.Next(difficulty);}
}
public bool IsWinningNumber(int number){
return number == winningNumber;
}
public decimal AmountWon(int luckyNumber){
decimal res;
if (IsWinningNumber(luckyNumber))
res = amountWon;
else
res = 0.0M;
return res;
}
}