Question

Design and implement an application 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. Use a sentinel value to determine whether the user wants 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.

Answer 1

Answer:

import java.util.Scanner;

import java.util.Random;

public class Hi_Lo {

// Create a scanner object to read from the keyboard

static Scanner kb = new Scanner(System.in);

// Create a Random object to be used to generate random numbers

static Random rand = new Random();

// This is the main method

public static void main(String[] args) {

 // Call the playGame() method

 playGame();

}

public static void playGame() {

 // Generate a random number between 1 and 100 both inclusive

 // Store the value in an int variable, num

 int num = rand.nextInt(100) + 1;

 // Create and initialize a variable to hold the user's guess

 int guess = 0;

 // Create and initialize a variable to hold the number of guesses

 int guesses = 0;

 // Create an infinite do while loop that keeps looping until a certain condition

 // is reached.

 do {

  // Prompt the user to enter a number between 1-100

  System.out.println("Guess what number I have (1-100)? ");

  // Store the user input in the guess variable

  guess = kb.nextInt();

  // Increment guess by one

  guesses++;

  // Check if the user's guess (guess) is greater than, less than or equal to the

  // generated random number (num).

  // If it is greater or lower, ask the user to try again.

  // If they are equal, display how many times they guessed and ask if they want

  // to play again.

  if (guess > num) {

   System.out.println("Too high, try again.");

  } else if (guess < num) {

   System.out.println("Too low, try again.");

  } else {

   System.out.println("You're right, the number is " + num);

   System.out.println("You guessed " + guesses + " times");

   // Ask the user if they want to play again

   // If yes, recursively call the playGame method again

   // Otherwise, break out of the loop.

   // Make sure the user's input is treated as case insensitive by using the

   // equalsIgnoreCase method.

   // The user can type yes, no, y or n. Case does not matter.

   System.out.println("Do you want to play again? (Y or N)");

   String answer = kb.next();

   if (answer.equalsIgnoreCase("Yes") || answer.equalsIgnoreCase("Y")) {

    playGame();

   } else {

    System.out.println("Game aborted. Thanks for your time");

    break;

   }

  }

 } while (true);

}

}

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Explanation:

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