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12.1 First we implement a Card class: enum Rank {TWO=2, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN JACK, QUEEN, KING, ACE}; enum Suit { CLUBS, DIAMONDS, HEARTS, SPADES }; class Card { friend class Hand; friend class Deck; friend ostream& operator<<(ostream&, const Card&); public: char rank() { return rank_; } char suit() { return suit_; } private: Card() { }; Card(Rank rank, Suit suit) : rank_(rank), suit_(suit) { };
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Card(const Card& c) : rank_(c.rank_), suit_(c.suit_) { }; ~Card() { }; Rank rank_; Suit suit_; }; This class uses enumeration types for a card s 13 possible ranks and 4 possible suits. Anticipating the implementation of Hand and Deck classes, we declare them here to be friend classes to the Card class. This will allow them to access the private members of the Card class. Notice that all three constructors and the destructor are declared to be private. This will prevent any cards to be created or destroyed except by the Card s two friend classes. Here is the implementation of the overloaded insertion operator << for cards: ostream& operator<<(ostream& ostr, const Card& card) { switch (card.rank_) { case TWO : ostr << "two of "; break; case THREE : ostr << "three of "; break; case FOUR : ostr << "four of "; break; case FIVE : ostr << "five of "; break; case SIX : ostr << "six of "; break; case SEVEN : ostr << "seven of "; break; case EIGHT : ostr << "eight of "; break; case NINE : ostr << "nine of "; break; case TEN : ostr << "ten of "; break; case JACK : ostr << "jack of "; break; case QUEEN : ostr << "queen of "; break; case KING : ostr << "king of "; break; case ACE : ostr << "ace of "; break; } switch (card.suit_) { case CLUBS : ostr << "clubs"; break; case DIAMONDS : ostr << "diamonds"; break; case HEARTS : ostr << "hearts"; break; case SPADES : ostr << "spades"; break; } return ostr; } Here is the implementation of the Hand class: #include "Card.h" class Hand { friend class Deck; public: Hand(unsigned n=5) : size(n) { cards = new Card[n]; } ~Hand() { delete [] cards; } void display(); int isPair(); int isTwoPair(); int isThreeOfKind(); int isStraight(); int isFlush(); int isFullHouse(); int isFourOfKind(); int isStraightFlush();
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private: unsigned size; Card* cards; void sort(); }; It uses an array to store the cards in the hand. The sort() function is a private utility that is called by the Deck class after dealing the hand. It can be implemented by any simple sort algorithm such as the Bubble Sort. The display() function is also straightforward, using the insertion operator << that is overloaded in the Card class. The eight boolean functions that identify special poker hands are not so straightforward. Here is the implementation of the isThreeOfKind() function: int Hand::isThreeOfKind() { if (cards[0].rank_ == cards[1].rank_ && cards[1].rank_ == cards[2].rank_ && cards[2].rank_ != cards[3].rank_ && cards[3].rank_ != cards[4].rank_) return 1; if (cards[0].rank_ != cards[1].rank_ && cards[1].rank_ == cards[2].rank_ && cards[2].rank_ == cards[3].rank_ && cards[3].rank_ != cards[4].rank_) return 1; if (cards[0].rank_ != cards[1].rank_ && cards[1].rank_ != cards[2].rank_ && cards[2].rank_ == cards[3].rank_ && cards[3].rank_ == cards[4].rank_) return 1; return 0; } Since the hand is sorted by rank_, the only way there could be three cards of the same rank with the other two cards of different rank would be one of the three forms: xxxyz, xyyyz, or xyzzz. If any of these three forms is identified, then the function returns 1. If not it returns 0. The isPair() function, the isTwoPair() function, the isFullHouse() function, and the isFourOfKind() function are similar to the isThreeOfKind() function. The isStraight() function, the isFlush() function, and the isStraightFlush() function are also tricky. Here is the isFlush() function: int Hand::isFlush() { for (int i = 1; i < size; i++) if (cards[i].suit_ != cards[0].suit_) return 0; return 1; } This compares the suit_ of each of the second through fifth cards (card[1] through card[4]). If any of these are not the same, then we know immediately that the hand is not a flush and can return 0. If the loop terminates naturally, then all four pairs match and 1 is returned. Here is the Deck class: #include "Random.h" #include "Hand.h" class Deck { public: Deck(); void shuffle(); void deal(Hand&, unsigned =5); private: unsigned top; Card cards[52];
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