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Thread: Multiplication program Loop

  1. #1
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    Talking Multiplication program Loop

    Hi guys! I have created a program that is designed to ask students multiple equation questions. The program will only be designed to ask single digit numbers. I have managed to create the questions and a random number generator, but i want this program to constantly loop, any ideas on how to implement a loop?

    Heres my code:
    import java.util.Scanner;
     
    public class SubtractionQuiz {
    public static void main (String[] args) {
    int number1 = (int) (Math.random() * 10);
    int number2 = (int) (Math.random() * 10);
     
     
     
    System.out.println("What is" + number1 + " * " + number2 + "?");
    Scanner input = new Scanner(System.in);
    int answer = input.nextInt();
     
     
    if (number1 * number2 == answer)
    System.out.println("You are correct!");
    else
    System.out.println("Wrong!");
     
     
     
    }
    }

    Thanks in advance!


  2. #2
    Administrator copeg's Avatar
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    Default Re: Multiplication program Loop

    Keep a flag that determines whether to quit or not, and evaluate that within a while or do/while loop
    The while and do-while Statements (The Java™ Tutorials > Learning the Java Language > Language Basics)

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    Default Re: Multiplication program Loop

    I want it to quit if a number like -1 is entered, could you maybe give me some examples of my code on how to do something like this?

    I have tried something like this:
     
    import java.util.Scanner;
     
    public class SubtractionQuiz {
    public static void main (String[] args) {
    int number1 = (int) (Math.random() * 10);
    int number2 = (int) (Math.random() * 10);
     
     
     
    do{
    System.out.println("What is" + number1 + " * " + number2 + "?");
    Scanner input = new Scanner(System.in);
    int answer = input.nextInt();
     
     
    if (number1 * number2 == answer)
    System.out.println("You are correct!");
    else
    System.out.println("Wrong!");
     
    }while (answer != -1);
    }
    }

    but it does not seem to be working
    Last edited by PhilThomspon; May 6th, 2012 at 01:20 PM.

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    Administrator copeg's Avatar
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    Default Re: Multiplication program Loop

    but it does not seem to be working
    Phrases such as this are not useful to us. Define not working...

    Think about your logic - write it out on paper if you have to - step through line by line and think what would happen based upon the current code - the result should be what is produced when you run the code (if not you need to do this step again and understand what is happening). Then think about your goal and how you can rearrange the code to meet that goal

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    Default Re: Multiplication program Loop

    I really do not have time for something like that, this program needs to be working by tomorrow morning for the kids and i was only given this on Friday just gone, i will have my friend help me but anyone who can come in and save the day i will be very grateful.

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    Default Re: Multiplication program Loop

    Here, I put in a line of code that loops the program.

    ...removed by moderator, although too late I might add
    Last edited by copeg; May 6th, 2012 at 03:32 PM.

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    Default Re: Multiplication program Loop

    Thank you so much! I can now go to sleep early!

  8. #8
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    Default Re: Multiplication program Loop

    @Firestar912, I highly recommend reading the forum rules and the following:

    The Problem with Spoon-feeding

    There is a high chance you just contributed to academic dishonesty...nice going.

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