/**
 *  Implements a simple guessing game.  The computer selects a random
 *  number in the range 1 to 100, inclusive, and the user tries to guess
 *  it.  The user gets up to six guesses.  After each wrong guess, the
 *  computer tells the user whether the guess was high or low.  If the
 *  user guesses the number within six guesses, the user wins; if the user
 *  makes six incorrect guesses, the user loses.  After the game ends,
 *  the computer asks whether the user would like to play again.
 */
public class GuessingGame {

    public static void main(String[] args) {
        System.out.println("Let's play a game.  I'll pick a number between");
        System.out.println("1 and 100, and you try to guess it.");
        boolean playAgain;
        do {
            playGame();  // call subroutine to play one game
            System.out.print("Would you like to play again? ");
            playAgain = TextIO.getlnBoolean();
        } while (playAgain);
        System.out.println("Thanks for playing.  Goodbye.");
    } // end of main()            

    
    /**
     * Lets the user play one game.
     */
    static void playGame() {
        int computersNumber; // A random number picked by the computer.
        int usersGuess;      // A number entered by user as a guess.
        int guessCount;      // Number of guesses the user has made.
        computersNumber = (int)(100 * Math.random()) + 1;
            // The value assigned to computersNumber is a randomly
            //    chosen integer between 1 and 100, inclusive.
        guessCount = 0;
        System.out.println();
        System.out.print("What is your first guess? ");
        while (true) {
            usersGuess = TextIO.getInt();  // Get the user's guess.
            guessCount++;
            if (usersGuess == computersNumber) {
                System.out.println("You got it in " + guessCount
                        + " guesses!  My number was " + computersNumber);
                break;  // The game is over; the user has won.
            }
            if (guessCount == 6) {
                System.out.println("You didn't get the number in 6 guesses.");
                System.out.println("You lose.  My number was " + computersNumber);
                break;  // The game is over; the user has lost.
            }
            // If we get to this point, the game continues.
            // Tell the user if the guess was too high or too low.
            if (usersGuess < computersNumber)
                System.out.print("That's too low.  Try again: ");
            else if (usersGuess > computersNumber)
                System.out.print("That's too high.  Try again: ");
        }
        System.out.println();
    } // end of playGame()

} // end of class GuessingGame