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Thread: Why is my do/while loop for play again not working?

  1. #1
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    Default Why is my do/while loop for play again not working?

    I am brand new to java. Can someone tell me why my do/while loop for playing again is not working?

    import java.util.Scanner;
     
    public class Lavoie_4_17 {
     
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
     
    		// Declaring and initializing variables.
    		int target_number, user_guess;
    		String play_again = "";
     
    		// Creating scanner for user input.
    		Scanner keyboard = new Scanner(System.in);
     
    		// Do/while loop creating a random number in the range of 1-10 then checking if user wants to play again.
    		do {
    			target_number =  (int)(Math.random()*10 + 1);
     
    			// Do/while loop asking for the user's guess then checking if user's guess is equal to the random number.
    			do {
    				System.out.println("Enter your guess (1-10) in integer form: ");
    				user_guess = keyboard.nextInt();
     
    				// If/else statement comparing user_guess to target number then displaying to the screen whether the guess was
    				// too high, too low, or equal to the target number. If the guess was correct, the user is asked if they would like 
    				// to play again.
    				if (user_guess > target_number) {
    					System.out.println("Too high, try again. ");
    				}
    				else if (user_guess < target_number) {
    					System.out.println("Too low, try again. ");
    				}
    				else {
    					System.out.println("You guessed right!! You won the chance to play again.\nWould you like to play again? (Y/N): ");
    					play_again = keyboard.nextLine();
    				}
     
    			}
     
    			while (target_number != user_guess);
    		}
     
    		while (play_again.equalsIgnoreCase("Y"));
     
    		// Closing keyboard scanner.
    		keyboard.close();
    	}
     
    }


    --- Update ---

    So I added a second scanner and used it for .nextline() input and it now works. Is there a way to clear the scanner so when I create larger programs I don't have to create a ton of scanners for multiple input types?

    import java.util.Scanner;
     
    public class Lavoie_4_17 {
     
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
     
    		// Declaring and initializing variables.
    		int target_number, user_guess;
    		String play_again = "";
     
    		// Creating scanners for user inputs.
    		Scanner keyboard = new Scanner(System.in);
    		Scanner keyboard_again = new Scanner(System.in);
     
    		// Do/while loop creating a random number in the range of 1-10 then checking if user wants to play again.
    		do {
    			target_number =  (int)(Math.random()*10 + 1);
     
    			// Do/while loop asking for the user's guess then checking if user's guess is equal to the random number.
    			do {
    				System.out.println("Enter your guess (1-10) in integer form: ");
    				user_guess = keyboard.nextInt();
     
    				// If/else statement comparing user_guess to target number then displaying to the screen whether the guess was
    				// too high, too low, or equal to the target number. If the guess was correct, the user is asked if they would like 
    				// to play again.
    				if (user_guess > target_number) {
    					System.out.println("Too high, try again. ");
    				}
    				else if (user_guess < target_number) {
    					System.out.println("Too low, try again. ");
    				}
    				else {
    					System.out.println("You guessed right!! You won the chance to play again.\nWould you like to play again? (Y/N): ");
    					play_again = keyboard_again.nextLine();
    				}
     
    			}
     
    			while (target_number != user_guess);
    		}
     
    		while (play_again.equalsIgnoreCase("Y"));
     
    		// Closing keyboard scanners.
    		keyboard.close();
    		keyboard_again.close();
    	}
     
    }

  2. #2
    Super Moderator Norm's Avatar
    Join Date
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    Default Re: Why is my do/while loop for play again not working?

    Here is one man's discussion: https://christprogramming.wordpress....on-mistakes-1/
    If you don't understand my answer, don't ignore it, ask a question.

  3. The Following User Says Thank You to Norm For This Useful Post:

    Siylo (June 1st, 2019)

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