blackjack.cc blackjack.cc nov 05, 13 11:33 Page 1/7 nov 05, 13 - PowerPoint PPT Presentation

Printed by Klas Arvidsson blackjack.cc blackjack.cc nov 05, 13 11:33 Page 1/7 nov 05, 13 11:33 Page 2/7 //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− class Player // Card, Deck and Player classes // This is in header (*.h) file(s) { public : // Remember how header file guard look? #ifndef BLACKJACK_CLASSES_H Player(std::string n); #define BLACKJACK_CLASSES_H // default values in interface specification (header file) #include <iostream> void draw(Deck& d, int count = 1); #include <vector> bool decideToHit(); #include <random> bool blackjack() const { return sum == 21; } bool stands() const { return stopped; } bool busted() const { return sum > 21; } //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− class Card // const: no member variable is modified int getScore() const { return sum; } { public : std::string getName() const { return name; } std::ostream& print(std::ostream& os); private : // "getter" functions access private parts safe int getValue() const { return value; } std::string name; std::string getSuit() const { return suit; } int sum; int getBlackjackValue() const ; bool stopped; }; private : friend class Deck; #endif // end of header guard Card(int v, std::string s); int value; // 1 − 13 std::string suit; // hearts, diamonds, clubs, spades }; //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− class Deck { public : Deck(); void shuffle(); Card top(); private : std::vector<Card> deck; // Create only one instance of random_device in your program, // creating several, or recreating one, will possibly yield // not−very−random numbers. // static: one for all instances of class static std::random_device rand; }; tisdag november 05, 2013 blackjack.cc 1/4

Printed by Klas Arvidsson blackjack.cc blackjack.cc nov 05, 13 11:33 Page 3/7 nov 05, 13 11:33 Page 4/7 //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− // Player member functions // Card, Deck and Player implementation //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− // This is in implementation (*.cc) file(s) Player::Player(string n) // Would #include "blackjack_classes.h" : name(n), sum(0), stopped(false) //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− { // initializer list preferred over this using namespace std; // name = n; // sum = 0; // Card member functions // stopped = false; //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− } Card::Card(int v, string s) : value(v), suit(s) { bool Player::decideToHit() // initializer list preferred over this { // value = v; string answer; // suit = s; cout << name << " , your score is " << sum << " . " << endl; } cout << " Do you want to take a hit? (Y/n) "; getline(cin, answer); // A long way toward operator<< ostream& Card::print(ostream& os) bool hit = (answer.size() == 0 || answer == " y " || answer == " yes "); { stopped = !hit; return os << value << " of " << suit; return hit; } } int Card::getBlackjackValue() const void Player::draw(Deck& d, int count) { { return min(value, 10); for (int i = 0; i < count; ++i) } { Card card = d.top(); // Deck member functions and members //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− cout << name << " draws "; card.print(cout) << endl; // static member must be created once! if (card.getBlackjackValue() == 1 && (sum + 11) <= 21) random_device Deck::rand; sum += 11; else Deck::Deck() { sum += card.getBlackjackValue(); for (int v = 1; v <= 13; ++v) if (sum > 21) { deck.push_back(Card(v, " hearts ")); { deck.push_back(Card(v, " diamonds ")); cout << name << " busted. " << endl; deck.push_back(Card(v, " spades ")); } deck.push_back(Card(v, " clubs ")); } } } } // std::shuffle would work instead void Deck::shuffle() { for (int i = 0; i < 52; ++i) { swap(deck.at(i), deck.at( rand() % 52 )); } } Card Deck::top() { Card c = deck.back(); deck.pop_back(); return c; } tisdag november 05, 2013 blackjack.cc 2/4

Printed by Klas Arvidsson blackjack.cc blackjack.cc nov 05, 13 11:33 Page 5/7 nov 05, 13 11:33 Page 6/7 // A simplified implementation of the card game Blackjack // Play the game... while ( done < v.size() ) // see wikipedia for full information of the game { #include <iostream> cout << endl << " Next round −−−−−−−−−−−−−−−− " << endl; #include <vector> done = 0; #include <algorithm> // sort for ( Player& player : v) { using namespace std; if ( player.busted() ) { //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− cout << player.getName() << " had gone bust! " << endl; // main program in it’s own implementation file ++done; // Would #include "blackjack_classes.h" } else if ( player.blackjack() ) //−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− int main() { { cout << player.getName() << " have Blackjack! " << endl; // discuss what happen when variables are declared ++done; Deck my_deck; } else if ( player.stands() ) // discuss how call to member function works { my_deck.shuffle(); cout << player.getName() << " stands. " << endl; ++done; cout << " Welcome to the game of Blackjack! " << endl; } else if ( player.decideToHit() ) vector<Player> v{ { Player(" One "), player.draw(my_deck); Player(" Two "), } else // Player choose to stand Player(" Three "), Player(" Four "), { Player(" Five ") ++done; }; } } unsigned int done = 0; } // Start by drawing two cards... for ( Player& player : v) { player.draw(my_deck); player.draw(my_deck); } tisdag november 05, 2013 blackjack.cc 3/4

Printed by Klas Arvidsson blackjack.cc nov 05, 13 11:33 Page 7/7 vector<Player>::iterator end; end = remove_if(v.begin(), v.end(), [](Player const & p)−>bool { return p.getScore() > 21; }); v.erase(end, v.end()); sort(v.begin(), v.end(), [](Player const & a, Player const & b)−>bool { return a.getScore() > b.getScore(); }); if ( v.size() == 0 ) { cout << " No winner! " << endl; } else { int winning_score = v.at(0).getScore(); unsigned int i{0}; while ( i < v.size() && v.at(i).getScore() == winning_score ) { cout << v.at(i).getName() << " wins! (score " << winning_score << " ) " << endl; ++i; } } return 0; } tisdag november 05, 2013 blackjack.cc 4/4