/**
 * Matt Kretchmar
 * February 7, 2006
 * Guesser.java
 * This program implements the game of guessing a secret number.  The 
 * computer selects a secret random number between 1 and 20.  The user
 * attempts to guess at this number in as few tries as possible.  The
 * computer provides "guess higher" and "guess lower" feedback.
 */

import java.util.Scanner;
import java.util.Random;

class Guesser
{
    public static void main ( String [] args )
    {
        int number;         // The computer's secret number
        int turns;          // The number of guesses the user has made
        int guess;          // The user's current guess
        String s;           // Used to read in a character
        char playAgain;     // Hold the Y/N to play again
        
        Scanner keyboard = new Scanner(System.in);
        Random generator = new Random();

        // outer loop repeats the game over and over as long as the user
        // wants to keep playing.
        do
        {
            // create a secret random number between 1 and 20 inclusive
            number = generator.nextInt(20)+1;
            turns = 0;
            guess = 0;
            
            // inner loop keeps the user guessing until they get the 
            // correct secret number.
            while ( guess != number )
            {
                System.out.println("Enter a guess: ");
                guess = keyboard.nextInt();
                turns++;
                
                if ( guess == number )
                    System.out.println("correct with " + turns + " guesses");
                else if ( guess < number )
                    System.out.println("guess higher");
                else
                    System.out.println("guess lower");
            }
            
            // See if the user wants to play the game again.
            System.out.println("Do you want to play again (Y,N)?");
            s = keyboard.next();
            playAgain = s.charAt(0);
            
        } while ( playAgain == 'y' || playAgain == 'Y' );
    }
}