Question

How can I do this program complete with input validation so that the computer prompts the user to enter a number 0 through 100 if he/she guesses anything lower than 0, a floating point number, or other characters? And later, prompts the user to enter yes or no if he/she enters anything else when the program prompts the user to play again?

Write a program that plays the Hi-Lo guessing game with numbers. The program should pick a random number between 1 and 100 (inclusive), then repeatedly prompt the user to guess the number. On each guess, report to the user that he or she is correct or that the guess is high or low. Continue accepting guesses until the user guesses correctly or chooses to quit. Count the number of guesses and report that value when the user guesses correctly. At the end of each game (by quitting or a correct guess), prompt to determine whether the user wants to play again. Continue playing games until the user chooses to stop. IN JAVA

Answer 1

import java.util.Scanner;

public class NumberguessingGame {
    public static void main(String args[]) {
        System.out.println("Welcome to the Number Guessing Game");
        Scanner s = new Scanner(System.in);

        int upperLimit = 100;
        char choice = 'y';
        do {
            // create random number generator
            NumberGame game = new NumberGame(upperLimit);
            System.out.println("OK, I'm thinking of a number between 0 and " + upperLimit);

            int guess = -1;

            while (guess != game.getNumber()) {

                System.out.print("Enter your Guess:");
                // read the user guess
                guess = Integer.parseInt(s.nextLine());
                // checking for the guess
                if (guess < game.getNumber()) {
                    // guess is low
                    System.out.println("Your guess is too low.");
                } else if (guess > game.getNumber()) {
                    // guess is high
                    System.out.println("Your guess is too high.");
                } else {
                    // Guess is correct
                    System.out.println("Correct!
" + "Bye!
" + "The number was " + game.getNumber());
                    System.out.println("It took " + game.getGuesses() + " tries");
                    break;
                }

                game.incrementGuessCount();
            }

            System.out.println("
Do you want to play again??");
            choice = s.nextLine().charAt(0);
        } while (choice == 'y');
        s.close();

    }
}

============

import java.util.Random;

public class NumberGame {
    private int upperLimit, number, guesses;

    public NumberGame(int upperLimit) {
        this.upperLimit = upperLimit;
        Random r = new Random();
        this.number = r.nextInt(upperLimit);
        this.guesses = 1;
    }

    public NumberGame() {
        this(50);
    }

    public int getUpperLimit() {
        return upperLimit;
    }

    public int getNumber() {
        return number;
    }

    public int getGuesses() {
        return guesses;
    }

    public void incrementGuessCount () {
        guesses++;
    }

}

Please upvote, as i have given the exact answer as asked in question. Still in case of any concerns in code, let me know in comments. Thanks!