Что такое 8037?
Это небольшая математическая игра: вы идете по улице, и просто считаете сумму цифр в автомобильных номерах. Эту игру мы реализуем в консольном варианте, на четырех языках: Swift, Objective-C, Java и C#.
В первой части мы написали часть приложения, которая спрашивает у пользователя ответ пока тот не введет слово для выхода из приложения. Как резонно заметили в комментариях, в таком случае правильнее все-таки использовать цикл вместо рекурсии. Поэтому первое, что мы сделаем — уберем рекурсию и напишем вместо нее цикл в методе startGame.
Swift:
func startGame() { var inputWord: String repeat { print(GreetingMessage.replacingOccurrences(of: ExitWordPlaceholder, with: self.exitWord)) inputWord = readLine() ?? "" } while check(inputWord: inputWord) } private func check(inputWord: String) -> Bool { let isExitWord = (inputWord == self.exitWord) print(isExitWord ? GoodByeMessage : InputAcceptMessage.replacingOccurrences(of: InputWordPlaceholder, with: inputWord)) return !isExitWord }
Objective-C:
- (void)startGame { NSString *inputWord; do { NSLog(GreetingMessage, self.exitWord); inputWord = [self readLine]; } while ([self checkInputWord:inputWord]); } - (BOOL)checkInputWord:(NSString *)inputWord { BOOL isExitWord = [inputWord isEqualToString:self.exitWord]; isExitWord ? NSLog(@"%@", GoodByeMessage) : NSLog(InputAcceptMessage, inputWord); return !isExitWord; }
Java:
void startGame() { String inputWord; do { System.out.println(String.format(GreetingMessage, exitWord)); inputWord = readLine(); } while (checkInputWord(inputWord)); } private boolean checkInputWord(String inputWord) { boolean isExitWord = inputWord.equals(exitWord); System.out.println(isExitWord ? GoodByeMessage : String.format(InputAcceptMessage, inputWord)); return !isExitWord; }
C#:
public void startGame() { string inputWord; do { Console.WriteLine(string.Format(GreetingMessage, exitWord)); inputWord = Console.ReadLine(); } while (checkInputWord(inputWord)); } bool checkInputWord(string inputWord) { bool isExitWord = inputWord.Equals(exitWord); Console.WriteLine(isExitWord ? GoodByeMessage : string.Format(InputAcceptMessage, inputWord)); return !isExitWord; }
Ну а дальше — мы, наконец, создадим класс нашей игры (как вы помните, мы специально создавали интерфейс (протокол) Game, который мы должны реализовать в нашем классе):
class Game8037: Game { // MARK: - Game func greet(with exitWord: String) { } func check(userAnswer: String) { } }
Оставим пока что методы протокола пустыми, и займемся организацией функциональности класса. В первую очередь нам понадобится enum с уровнями сложности:
private enum Level: String { case easy case normal case hard1 case hard2 func forSelect() -> String { return LevelForSelect.replacingOccurrences(of: LevelPlaceholder, with: self.rawValue) .replacingOccurrences(of: LevelNumberPlaceholder, with: "\(self.hashValue+1)") } }
В enum мы добавили метод forSelect() он будет для каждого уровня сложности создавать строку вида 1 - easy (номер уровня и его название). Это нам пригодится для предложения пользователю выбрать уровень сложности. Дальше нам понадобятся два свойства которые будут содержать в себе выбранный уровень и правильный ответ на задание:
private var level: Level private var result: UInt32
Теперь мы можем написать наш инициализатор:
init?() { self.result = 0 let levels = Level.easy.forSelect() + Level.normal.forSelect() + Level.hard1.forSelect() + Level.hard2.forSelect() print(StartGreeting.replacingOccurrences(of: LevelsPlaceholder, with: levels)) let selectedLevel = readLine() ?? "" switch selectedLevel { case "\(Level.easy.hashValue+1)", Level.easy.rawValue: self.level = .easy case "\(Level.normal.hashValue+1)", Level.normal.rawValue: self.level = .normal case "\(Level.hard1.hashValue+1)", Level.hard1.rawValue: self.level = .hard1 case "\(Level.hard2.hashValue+1)", Level.hard2.rawValue: self.level = .hard2 default: print(ErrorLevelMessage) return nil } }
Как видите, для начала, мы задаем значение по-умолчанию для свойства result (оно у нас пока что хранит в себе ноль). Дальше мы формируем информационную строку для пользователя о необходимости выбрать уровень сложности. В консоли это выглядит так:
Ну и потом, мы считываем введенный пользователем уровень сложности и, если он корректен — сохраняем его в свойстве level.
Теперь нам понадобится метод расчета правильного ответа на задание в зависимости от уровня:
private func result(with level: Level, and randomizer: Randomizer) -> UInt32 { let result: UInt32 switch level { case .easy: result = randomizer.firstNumber + randomizer.secondNumber + randomizer.thirdNumber + randomizer.fourthNumber case .normal: result = randomizer.firstNumber*10 + randomizer.secondNumber + randomizer.thirdNumber*10 + randomizer.fourthNumber case .hard1: let firstNumber = (randomizer.firstNumber == 0) ? 1 : randomizer.firstNumber let secondNumber = (randomizer.secondNumber == 0) ? 1 : randomizer.secondNumber let thirdNumber = (randomizer.thirdNumber == 0) ? 1 : randomizer.thirdNumber let fourthNumber = (randomizer.fourthNumber == 0) ? 1 : randomizer.fourthNumber result = firstNumber * secondNumber * thirdNumber * fourthNumber case .hard2: result = (randomizer.firstNumber*10 + randomizer.secondNumber) * (randomizer.thirdNumber*10 + randomizer.fourthNumber) } return result }
И, наконец, нужно реализовать методы протокола Game.
Метод greet(with exitWord: String):
func greet(with exitWord: String) { let randomizer = Randomizer() self.result = self.result(with: self.level, and: randomizer) let task = BaseGreeting.replacingOccurrences(of: FirstNumberPlaceholder, with: "\(randomizer.firstNumber)") .replacingOccurrences(of: SecondNumberPlaceholder, with: "\(randomizer.secondNumber)") .replacingOccurrences(of: ThirdNumberPlaceholder, with: "\(randomizer.thirdNumber)") .replacingOccurrences(of: FourthNumberPlaceholder, with: "\(randomizer.fourthNumber)") print(TaskMessage.replacingOccurrences(of: TaskPlaceholder, with: task) .replacingOccurrences(of: ExitWordPlaceholder, with: exitWord)) }
Тут мы создаем новый Randomizer и рассчитываем правильный ответ для текущего уровня сложности. После чего показываем пользователю задание.
Метод check(userAnswer: String):
func check(userAnswer: String) { if self.result == UInt32(userAnswer) { print(CorrectMessage) } else { print(WrongMessage) } }
Тут все просто: мы просто сравниваем правильный ответ с тем, что ввел пользователь и выводим информационное сообщение на экран.
Итак полный текст класса в Swift выглядит так:
private let LevelsPlaceholder = "{levels}" private let LevelNumberPlaceholder = "{levelNumber}" private let LevelPlaceholder = "{level}" private let FirstNumberPlaceholder = "{firstNumber}" private let SecondNumberPlaceholder = "{secondNumber}" private let ThirdNumberPlaceholder = "{thirdNumber}" private let FourthNumberPlaceholder = "{fourthNumber}" private let ExitWordPlaceholder = "{exitWord}" private let TaskPlaceholder = "{taskPlaceholder}" private let StartGreeting = "Hello, let's play. Please select difficulty level:\(LevelsPlaceholder)" private let LevelForSelect = "\n\(LevelNumberPlaceholder) - \(LevelPlaceholder)" private let BaseGreeting = "\(FirstNumberPlaceholder) \(SecondNumberPlaceholder) \(ThirdNumberPlaceholder) \(FourthNumberPlaceholder)" private let TaskMessage = "The next task is \(TaskPlaceholder)\n(enter \"\(ExitWordPlaceholder)\" for exit)" private let CorrectMessage = "Absolutely right.\n" private let WrongMessage = "Sorry, you made a mistake. Try again.\n" private let ErrorLevelMessage = "Sorry, you have selected wrong level. Good bye.\n" class Game8037: Game { private enum Level: String { case easy case normal case hard1 case hard2 func forSelect() -> String { return LevelForSelect.replacingOccurrences(of: LevelPlaceholder, with: self.rawValue) .replacingOccurrences(of: LevelNumberPlaceholder, with: "\(self.hashValue+1)") } } private var level: Level private var result: UInt32 init?() { self.result = 0 let levels = Level.easy.forSelect() + Level.normal.forSelect() + Level.hard1.forSelect() + Level.hard2.forSelect() print(StartGreeting.replacingOccurrences(of: LevelsPlaceholder, with: levels)) let selectedLevel = readLine() ?? "" switch selectedLevel { case "\(Level.easy.hashValue+1)", Level.easy.rawValue: self.level = .easy case "\(Level.normal.hashValue+1)", Level.normal.rawValue: self.level = .normal case "\(Level.hard1.hashValue+1)", Level.hard1.rawValue: self.level = .hard1 case "\(Level.hard2.hashValue+1)", Level.hard2.rawValue: self.level = .hard2 default: print(ErrorLevelMessage) return nil } } private func result(with level: Level, and randomizer: Randomizer) -> UInt32 { let result: UInt32 switch level { case .easy: result = randomizer.firstNumber + randomizer.secondNumber + randomizer.thirdNumber + randomizer.fourthNumber case .normal: result = randomizer.firstNumber*10 + randomizer.secondNumber + randomizer.thirdNumber*10 + randomizer.fourthNumber case .hard1: let firstNumber = (randomizer.firstNumber == 0) ? 1 : randomizer.firstNumber let secondNumber = (randomizer.secondNumber == 0) ? 1 : randomizer.secondNumber let thirdNumber = (randomizer.thirdNumber == 0) ? 1 : randomizer.thirdNumber let fourthNumber = (randomizer.fourthNumber == 0) ? 1 : randomizer.fourthNumber result = firstNumber * secondNumber * thirdNumber * fourthNumber case .hard2: result = (randomizer.firstNumber*10 + randomizer.secondNumber) * (randomizer.thirdNumber*10 + randomizer.fourthNumber) } return result } // MARK: - Game func greet(with exitWord: String) { let randomizer = Randomizer() self.result = self.result(with: self.level, and: randomizer) let task = BaseGreeting.replacingOccurrences(of: FirstNumberPlaceholder, with: "\(randomizer.firstNumber)") .replacingOccurrences(of: SecondNumberPlaceholder, with: "\(randomizer.secondNumber)") .replacingOccurrences(of: ThirdNumberPlaceholder, with: "\(randomizer.thirdNumber)") .replacingOccurrences(of: FourthNumberPlaceholder, with: "\(randomizer.fourthNumber)") print(TaskMessage.replacingOccurrences(of: TaskPlaceholder, with: task) .replacingOccurrences(of: ExitWordPlaceholder, with: exitWord)) } func check(userAnswer: String) { if self.result == UInt32(userAnswer) { print(CorrectMessage) } else { print(WrongMessage) } } }
Реализация этого же класса в Objective-C:
// файл заголовка Game8037.h @interface Game8037 : NSObject <Game> @end // файл реализации GameStart.m const NSString *EasyLevelNumber = @"1"; const NSString *NormalLevelNumber = @"2"; const NSString *Hard1LevelNumber = @"3"; const NSString *Hard2LevelNumber = @"4"; const NSString *EasyLevelName = @"easy"; const NSString *NormalLevelName = @"normal"; const NSString *Hard1LevelName = @"hard1"; const NSString *Hard2LevelName = @"hard2"; const NSString *StartGreeting = @"Hello, let's play. Please select difficulty level:%@"; const NSString *LevelForSelect = @"\n%@ - %@"; const NSString *BaseGreeting = @"%i %i %i %i"; const NSString *TaskMessage = @"The next task is %@\n(enter \"%@\" for exit)"; const NSString *CorrectMessage = @"Absolutely right.\n"; const NSString *WrongMessage = @"Sorry, you made a mistake. Try again.\n"; const NSString *ErrorLevelMessage = @"Sorry, you have selected wrong level. Good bye.\n"; typedef enum { LevelEasy, LevelNormal, LevelHard1, LevelHard2 } Level; @interface Game8037() @property (assign, nonatomic) Level level; @property (assign, nonatomic) NSInteger result; @end @implementation Game8037 - (instancetype)init { self = [super init]; if (self) { self.result = 0; NSString *levels = [NSString stringWithFormat:@"%@%@%@%@", [self levelForSelect:LevelEasy], [self levelForSelect:LevelNormal], [self levelForSelect:LevelHard1], [self levelForSelect:LevelHard2]]; NSLog(StartGreeting, levels); NSString *selectedLevel = [self readLine]; if ([selectedLevel isEqualToString:EasyLevelNumber] || [selectedLevel isEqualToString:EasyLevelName]) { self.level = LevelEasy; } else if ([selectedLevel isEqualToString:NormalLevelNumber] || [selectedLevel isEqualToString:NormalLevelName]) { self.level = LevelNormal; } else if ([selectedLevel isEqualToString:Hard1LevelNumber] || [selectedLevel isEqualToString:Hard1LevelName]) { self.level = LevelHard1; } else if ([selectedLevel isEqualToString:Hard2LevelNumber] || [selectedLevel isEqualToString:Hard2LevelName]) { self.level = LevelHard2; } else { NSLog(@"%@", ErrorLevelMessage); return nil; } } return self; } - (NSString *)levelForSelect:(Level)level { NSString *levelNumber; NSString *levelName; switch (level) { case LevelEasy: levelNumber = EasyLevelNumber; levelName = EasyLevelName; break; case LevelNormal: levelNumber = NormalLevelNumber; levelName = NormalLevelName; break; case LevelHard1: levelNumber = Hard1LevelNumber; levelName = Hard1LevelName; break; case LevelHard2: levelNumber = Hard2LevelNumber; levelName = Hard2LevelName; break; } return [NSString stringWithFormat:LevelForSelect, levelNumber, levelName]; } - (NSInteger)resultWithLevel:(Level)level andRandomizer:(Randomizer *)randomizer { NSInteger result = 0; switch (level) { case LevelEasy: result = randomizer.firstNumber + randomizer.secondNumber + randomizer.thirdNumber + randomizer.fourthNumber; break; case LevelNormal: result = randomizer.firstNumber*10 + randomizer.secondNumber + randomizer.thirdNumber*10 + randomizer.fourthNumber; break; case LevelHard1: result = (randomizer.firstNumber == 0 ? 1 : randomizer.firstNumber) * (randomizer.secondNumber == 0 ? 1 : randomizer.secondNumber) * (randomizer.thirdNumber == 0 ? 1 : randomizer.thirdNumber) * (randomizer.fourthNumber == 0 ? 1 : randomizer.fourthNumber); break; case LevelHard2: result = (randomizer.firstNumber*10 + randomizer.secondNumber) * (randomizer.thirdNumber*10 + randomizer.fourthNumber); break; } return result; } - (NSString *)descriptionOfLevel:(Level)level { NSString *result = @""; switch (level) { case LevelEasy: result = EasyLevelName; break; case LevelNormal: result = NormalLevelName; break; case LevelHard1: result = Hard1LevelName; break; case LevelHard2: result = Hard2LevelName; break; } return result; } - (NSString *)readLine { char inputValue; scanf("%s", &inputValue); return [NSString stringWithUTF8String:&inputValue]; } #pragma mark - Game - (void)greetWithExitWord:(NSString *)exitWord { Randomizer *randomizer = [[Randomizer alloc] init]; self.result = [self resultWithLevel:self.level andRandomizer:randomizer]; NSString *task = [NSString stringWithFormat:BaseGreeting, randomizer.firstNumber, randomizer.secondNumber, randomizer.thirdNumber, randomizer.fourthNumber]; NSLog(TaskMessage, task, exitWord); } - (void)checkUserAnswer:(NSString *)userAnswer { if (self.result == [userAnswer integerValue]) { NSLog(@"%@", CorrectMessage); } else { NSLog(@"%@", WrongMessage); } } @end
Java:
public class Game8037 implements Game { private static final String EasyLevelNumber = "1"; private static final String NormalLevelNumber = "2"; private static final String Hard1LevelNumber = "3"; private static final String Hard2LevelNumber = "4"; private static final String EasyLevelName = "easy"; private static final String NormalLevelName = "normal"; private static final String Hard1LevelName = "hard1"; private static final String Hard2LevelName = "hard2"; private static final String StartGreeting = "Hello, let's play. Please select difficulty level:%s"; private static final String LevelForSelect = "\n%s - %s"; private static final String BaseGreeting = "%s %s %s %s"; private static final String TaskMessage = "The next task is %s\n(enter \"%s\" for exit)"; private static final String CorrectMessage = "Absolutely right.\n"; private static final String WrongMessage = "Sorry, you made a mistake. Try again.\n"; private static final String ErrorLevelMessage = "Sorry, you have selected wrong level. Good bye.\n"; private enum Level { Easy { public String toString() { return EasyLevelName; } }, Normal { public String toString() { return NormalLevelName; } }, Hard1 { public String toString() { return Hard1LevelName; } }, Hard2 { public String toString() { return Hard2LevelName; } } } private Level level; private int result; private Game8037(Level level) { this.level = level; this.result = 0; } @Nullable public static Game8037 Create() { String levels = String.format("%s%s%s%s", levelForSelect(Level.Easy), levelForSelect(Level.Normal), levelForSelect(Level.Hard1), levelForSelect(Level.Hard2)); System.out.println(String.format(StartGreeting, levels)); Game8037 game8037; String selectedLevel = readLine(); switch (selectedLevel) { case EasyLevelNumber: case EasyLevelName: game8037 = new Game8037(Level.Easy); break; case NormalLevelNumber: case NormalLevelName: game8037 = new Game8037(Level.Normal); break; case Hard1LevelNumber: case Hard1LevelName: game8037 = new Game8037(Level.Hard1); break; case Hard2LevelNumber: case Hard2LevelName: game8037 = new Game8037(Level.Hard2); break; default: game8037 = null; System.out.println(ErrorLevelMessage); break; } return game8037; } private static String levelForSelect(Level level) { String levelNumber = ""; String levelName = ""; switch (level) { case Easy: levelNumber = EasyLevelNumber; levelName = EasyLevelName; break; case Normal: levelNumber = NormalLevelNumber; levelName = NormalLevelName; break; case Hard1: levelNumber = Hard1LevelNumber; levelName = Hard1LevelName; break; case Hard2: levelNumber = Hard2LevelNumber; levelName = Hard2LevelName; break; } return String.format(LevelForSelect, levelNumber, levelName); } private int resultWithLevelAndRandomizer(Level level, Randomizer randomizer) { int result = 0; switch (level) { case Easy: result = randomizer.firstNumber + randomizer.secondNumber + randomizer.thirdNumber + randomizer.fourthNumber; break; case Normal: result = randomizer.firstNumber*10 + randomizer.secondNumber + randomizer.thirdNumber*10 + randomizer.fourthNumber; break; case Hard1: int firstNumber = (randomizer.firstNumber == 0) ? 1 : randomizer.firstNumber; int secondNumber = (randomizer.secondNumber == 0) ? 1 : randomizer.secondNumber; int thirdNumber = (randomizer.thirdNumber == 0) ? 1 : randomizer.thirdNumber; int fourthNumber = (randomizer.fourthNumber == 0) ? 1 : randomizer.fourthNumber; result = firstNumber * secondNumber * thirdNumber * fourthNumber; break; case Hard2: result = (randomizer.firstNumber*10 + randomizer.secondNumber) * (randomizer.thirdNumber*10 + randomizer.fourthNumber); break; } return result; } static private String readLine() { java.util.Scanner scanner = new java.util.Scanner(System.in); return scanner.next(); } @Override public void greet(String exitWord) { Randomizer randomizer = new Randomizer(); result = resultWithLevelAndRandomizer(level, randomizer); String task = String.format(BaseGreeting, randomizer.firstNumber, randomizer.secondNumber, randomizer.thirdNumber, randomizer.fourthNumber); System.out.println(String.format(TaskMessage, task, exitWord)); } @Override public void checkUserAnswer(String userAnswer) { int answer; try { answer = Integer.parseInt(userAnswer); } catch (Exception e) { System.out.println(WrongMessage); return; } if (result == answer) { System.out.println(CorrectMessage); } else { System.out.println(WrongMessage); } } }
C#:
public class Game8037 : IGame { const string EasyLevelNumber = "1"; const string NormalLevelNumber = "2"; const string Hard1LevelNumber = "3"; const string Hard2LevelNumber = "4"; const string EasyLevelName = "easy"; const string NormalLevelName = "normal"; const string Hard1LevelName = "hard1"; const string Hard2LevelName = "hard2"; const string StartGreeting = "Hello, let's play. Please select difficulty level:{0}"; const string LevelForSelect = "\n{0} - {1}"; const string BaseGreeting = "{0} {1} {2} {3}"; const string TaskMessage = "The next task is {0}\n(enter \"{1}\" for exit)"; const string CorrectMessage = "Absolutely right.\n"; const string WrongMessage = "Sorry, you made a mistake. Try again.\n"; const string ErrorLevelMessage = "Sorry, you have selected wrong level. Good bye.\n"; enum Level { Easy, Normal, Hard1, Hard2 }; Level level; int result; private Game8037(Level level) { this.level = level; result = 0; } public static Game8037 Create() { string levels = string.Format("{0}{1}{2}{3}", levelForSelect(Level.Easy), levelForSelect(Level.Normal), levelForSelect(Level.Hard1), levelForSelect(Level.Hard2)); Console.WriteLine(string.Format(StartGreeting, levels)); Game8037 game8037; string selectedLevel = Console.ReadLine(); switch (selectedLevel) { case EasyLevelNumber: case EasyLevelName: game8037 = new Game8037(Level.Easy); break; case NormalLevelNumber: case NormalLevelName: game8037 = new Game8037(Level.Normal); break; case Hard1LevelNumber: case Hard1LevelName: game8037 = new Game8037(Level.Hard1); break; case Hard2LevelNumber: case Hard2LevelName: game8037 = new Game8037(Level.Hard2); break; default: game8037 = null; Console.WriteLine(ErrorLevelMessage); break; } return game8037; } static string levelForSelect(Level level) { string levelNumber = ""; string levelName = ""; switch (level) { case Level.Easy: levelNumber = EasyLevelNumber; levelName = EasyLevelName; break; case Level.Normal: levelNumber = NormalLevelNumber; levelName = NormalLevelName; break; case Level.Hard1: levelNumber = Hard1LevelNumber; levelName = Hard1LevelName; break; case Level.Hard2: levelNumber = Hard2LevelNumber; levelName = Hard2LevelName; break; } return string.Format(LevelForSelect, levelNumber, levelName); } int resultWithLevelAndRandomizer(Level level, Randomizer randomizer) { int result = 0; switch (level) { case Level.Easy: result = randomizer.firstNumber + randomizer.secondNumber + randomizer.thirdNumber + randomizer.fourthNumber; break; case Level.Normal: result = randomizer.firstNumber * 10 + randomizer.secondNumber + randomizer.thirdNumber * 10 + randomizer.fourthNumber; break; case Level.Hard1: int firstNumber = (randomizer.firstNumber == 0) ? 1 : randomizer.firstNumber; int secondNumber = (randomizer.secondNumber == 0) ? 1 : randomizer.secondNumber; int thirdNumber = (randomizer.thirdNumber == 0) ? 1 : randomizer.thirdNumber; int fourthNumber = (randomizer.fourthNumber == 0) ? 1 : randomizer.fourthNumber; result = firstNumber* secondNumber * thirdNumber * fourthNumber; break; case Level.Hard2: result = (randomizer.firstNumber * 10 + randomizer.secondNumber) * (randomizer.thirdNumber * 10 + randomizer.fourthNumber); break; } return result; } string descriptionOfLevel(Level level) { string result = ""; switch (level) { case Level.Easy: result = "easy"; break; case Level.Normal: result = "normal"; break; case Level.Hard1: result = "hard1"; break; case Level.Hard2: result = "hard2"; break; } return result; } public void greet(string exitWord) { Randomizer randomizer = new Randomizer(); result = resultWithLevelAndRandomizer(level, randomizer); string task = string.Format(BaseGreeting, randomizer.firstNumber, randomizer.secondNumber, randomizer.thirdNumber, randomizer.fourthNumber); Console.WriteLine(string.Format(TaskMessage, task, exitWord)); } public void checkUserAnswer(string userAnswer) { int answer; try { answer = int.Parse(userAnswer); } catch { Console.WriteLine(WrongMessage); return; } if (result == answer) { Console.WriteLine(CorrectMessage); } else { Console.WriteLine(WrongMessage); } } }
В Java и C# есть нюанс при создании объекта класса Game8037. Дело в том, что здесь нет failable инициализаторов, поэтому мы воспользовались статическим методом для создания объекта.
Нам остается добавить создание нашей игры в класс GameStart и воспользоваться методами greet(...) и check(...). Теперь класс GameStart выглядит так.
Swift:
class GameStart { private var exitWord: String private var game: Game init?(with exitWord: String) { self.exitWord = exitWord if let game = Game8037() { self.game = game } else { return nil } } func startGame() { var inputWord: String repeat { self.game.greet(with: self.exitWord) inputWord = readLine() ?? "" } while check(inputWord: inputWord) } private func check(inputWord: String) -> Bool { let isExitWord = (inputWord == self.exitWord) if isExitWord { print(GoodByeMessage) } else { self.game.check(userAnswer: inputWord) } return !isExitWord } }
Objective-C:
@interface GameStart() @property (strong, nonatomic) NSString *exitWord; @property (strong, nonatomic) id<Game> game; @end @implementation GameStart - (instancetype)initWithExitWord:(NSString *)exitWord { self = [super init]; if (self) { self.exitWord = exitWord; self.game = [[Game8037 alloc] init]; } return self; } - (void)startGame { if (self.game) { NSString *inputWord; do { [self.game greetWithExitWord:self.exitWord]; inputWord = [self readLine]; } while ([self checkInputWord:inputWord]); } } - (BOOL)checkInputWord:(NSString *)inputWord { BOOL isExitWord = [inputWord isEqualToString:self.exitWord]; if (isExitWord) { NSLog(@"%@", GoodByeMessage); } else { [self.game checkUserAnswer:inputWord]; } return !isExitWord; } - (NSString *)readLine { char inputValue; scanf("%s", &inputValue); return [NSString stringWithUTF8String:&inputValue]; } @end
Java:
public class GameStart { private static final String GreetingMessage = "Please enter your answer (enter \"%s\" for exit):"; private static final String InputAcceptMessage = "You entered \"%s\".\n"; private static final String GoodByeMessage = "Good bye.\n"; private String exitWord; private Game game; public GameStart(String exitWord) { this.exitWord = exitWord; this.game = Game8037.Create(); } void startGame() { if (game != null) { String inputWord; do { game.greet(exitWord); inputWord = readLine(); } while (checkInputWord(inputWord)); } } private boolean checkInputWord(String inputWord) { boolean isExitWord = inputWord.equals(exitWord); if (isExitWord) { System.out.println(GoodByeMessage); } else { game.checkUserAnswer(inputWord); } return !isExitWord; } private String readLine() { java.util.Scanner scanner = new java.util.Scanner(System.in); return scanner.next(); } }
C#:
public class GameStart { const string GreetingMessage = "Please enter your answer (enter \"{0}\" for exit):"; const string InputAcceptMessage = "You entered \"{0}\".\n"; const string GoodByeMessage = "Good bye.\n"; readonly string exitWord; readonly IGame iGame; public GameStart(string exitWord) { this.exitWord = exitWord; iGame = Game8037.Create(); } public void startGame() { if (iGame != null) { string inputWord; do { iGame.greet(exitWord); inputWord = Console.ReadLine(); } while (checkInputWord(inputWord)); } } bool checkInputWord(string inputWord) { bool isExitWord = inputWord.Equals(exitWord); if (isExitWord) { Console.WriteLine(GoodByeMessage); } else { iGame.checkUserAnswer(inputWord); } return !isExitWord; } }
Как видите, у нас добавилось свойство game типа Game (или IGame в C#). Также в методе startGame() мы вызываем self.game.greet(...), а в методе check(...) — self.game.check(...). Таким образом, в будущем можно будет вместо Game8037 подставить туда любую другую игру, которая реализует наш протокол Game.
Заключение
На этом работа над нашим приложением окончена, исходный код всего этого можно найти здесь: https://github.com/ssuhanov/8037
Всем спасибо за внимание, замечания, критику, советы, пожелания. 🙂
ссылка на оригинал статьи https://habrahabr.ru/post/327168/
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