using System;

using System.Collections.Generic;

​

public enum Suit

{

    Hearts,

    Diamonds,

    Clubs,

    Spades

}

​

public enum Rank

{

    Two = 2,

    Three,

    Four,

    Five,

    Six,

    Seven,

    Eight,

    Nine,

    Ten,

    Jack,

    Queen,

    King,

    Ace

}

​

public class Card

{

    public Suit Suit { get; set; }

    public Rank Rank { get; set; }

​

    public Card(Suit suit, Rank rank)

    {

        Suit = suit;

        Rank = rank;

    }

​

    public override string ToString()

    {

        return String.Format("{0} of {1}", Rank, Suit);

    }

}

​

public class Deck

{

    private List<Card> cards;

    private Random random;

​

    public Deck()

    {

        cards = new List<Card>();

        random = new Random();

        foreach (Suit suit in Enum.GetValues(typeof(Suit)))

        {

            foreach (Rank rank in Enum.GetValues(typeof(Rank)))

            {

                cards.Add(new Card(suit, rank));

            }

        }

    }

​

    public void Shuffle()

    {

        for (int i = cards.Count - 1; i > 0; i--)

        {

            int j = random.Next(i + 1);

            Card temp = cards[i];

            cards[i] = cards[j];

            cards[j] = temp;

        }

    }

​

    public Card Draw()

    {

        if (cards.Count == 0) throw new InvalidOperationException("The deck is empty.");

        Card card = cards[cards.Count - 1];

        cards.RemoveAt(cards.Count - 1);

        return card;

    }

}

​

public class Hand

{

    public List<Card> Cards { get; private set; }

​

    public Hand()

    {

        Cards = new List<Card>();

    }

​

    public void AddCard(Card card)

    {

        Cards.Add(card);

    }

​

    public int GetTotalValue()

    {

        int total = 0;

        int aceCount = 0;

​

        foreach (Card card in Cards)

        {

            if (card.Rank >= Rank.Two && card.Rank <= Rank.Ten)

            {

                total += (int)card.Rank;

            }

            else if (card.Rank >= Rank.Jack && card.Rank <= Rank.King)

            {

                total += 10;

            }

            else if (card.Rank == Rank.Ace)

            {

                total += 11;

                aceCount++;

            }

        }

​

        while (total > 21 && aceCount > 0)

        {

            total -= 10;

            aceCount--;

        }

​

        return total;

    }

​

    public override string ToString()

    {

        return String.Join(", ", Cards);

    }

}

​

public class Program

{

    public static void Main(string[] args)

    {

        Deck deck = new Deck();

        deck.Shuffle();

​

        Hand playerHand = new Hand();

        Hand dealerHand = new Hand();

​

        playerHand.AddCard(deck.Draw());

        playerHand.AddCard(deck.Draw());

​

        dealerHand.AddCard(deck.Draw());

        dealerHand.AddCard(deck.Draw());

​

        Console.WriteLine("Welcome to Blackjack!");

        Console.WriteLine(String.Format("Dealer's Hand: {0} and [hidden]", dealerHand.Cards[0]));

        Console.WriteLine(String.Format("Player's Hand: {0}", playerHand));

​

        bool playerStands = false;

        while (playerHand.GetTotalValue() < 21 && !playerStands)

        {

            Console.Write("Do you want to (H)it or (S)tand? ");

            string playerChoice = Console.ReadLine().ToUpper();

​

            if (playerChoice == "H")

            {

                playerHand.AddCard(deck.Draw());

                Console.WriteLine(String.Format("Player's Hand: {0}", playerHand));

            }

            else if (playerChoice == "S")

            {

                playerStands = true;

            }

        }

​

        while (dealerHand.GetTotalValue() < 17)

        {

            dealerHand.AddCard(deck.Draw());

        }

​

        Console.WriteLine(String.Format("Dealer's Hand: {0}", dealerHand));

​

        int playerTotal = playerHand.GetTotalValue();

        int dealerTotal = dealerHand.GetTotalValue();

​

        Console.WriteLine(String.Format("Player's Total: {0}", playerTotal));

        Console.WriteLine(String.Format("Dealer's Total: {0}", dealerTotal));

​

        if (playerTotal > 21)

        {

            Console.WriteLine("Player busts! Dealer wins.");

        }

        else if (dealerTotal > 21 || playerTotal > dealerTotal)

        {

            Console.WriteLine("Player wins!");

        }

        else if (dealerTotal > playerTotal)

        {

            Console.WriteLine("Dealer wins!");

        }

        else

        {

            Console.WriteLine("It's a tie!");

        }

    }

}

​