CODEWITHSUNDEEP
javawhile-loopprompt
Aleksandr Hovhannisyan
Aleksandr Hovhannisyan

Reputation: 1620

Java -- how to loop a quiz until the user decides to quit?

I have the following simple Java program that prompts a user with a subtraction quiz. Can someone nudge me along in the right path of how I can implement a loop that keeps generating numbers, doing the calculations, prompting the user, and giving feedback until the user chooses to stop? I imagine it would involve a while loop, but how would the user signal that they want to stop? I understand I could tell them to "press ___ whenever you want to quit", but the rest of the program is constantly prompting for the user to enter an integer...so what if they choose to enter a key to quit (suppose "Q") when the next question is given to them and the computer is waiting for a command-line response that is an integer (since Q is not an integer)?

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

public class MathQuiz
{

    public static void main( String [] args )
    {

        // random number generator
        Random rng = new Random();


        // scanner to get user's answer
        Scanner scan = new Scanner( System.in );


        // generates random number, 1 <= n <= 9
        int num1 = rng.nextInt( 10 );
        int num2 = rng.nextInt( 10 );


        // prompt, answer, user's answer, and feedback
        String prompt = "What is " + num1 + " - " + num2 + "?";
        int answer = Math.abs( num1 - num2 );
        int userAnswer = 0;
        String feedback = "That's correct, way to go!";


        // figure out which is larger
        if( num1 < num2 )
        {
            prompt= "What is " + num2 + " - " + num1 + "?";
        }

        System.out.println( prompt );
        userAnswer = scan.nextInt();


        if( userAnswer != answer )
        {
            feedback = "That is incorrect.";
        }

        System.out.println( feedback );


    }


}

Upvotes: 1

Views: 2064

Answers (1)

Abdelrahman Saleh
Abdelrahman Saleh

Reputation: 153

First of all remove the latest if 

if( userAnswer != answer )
{
    feedback = "That is incorrect.";
}

and edit it to

do
{
    String feedback ;
    /*
    your program here
    */
    System.out.println("again 'Y'") ;
    choice= scan.nextLine() ;
}while("Y".equalsIgnoreCase(choice))

Upvotes: 2

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