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Thread: Can't fix my own errors

  1. #1
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    Angry Can't fix my own errors

    Hello to all! First I would like to say that I am only a very real beginner. IN fact, I have recently started taking a Java Programming class, but have found it very interesting. Now I have messing around with a code. And for some reason, I can not get the problem solved. I have completed the same code but without the JOptionPane.showDialogBox.

    My error message is


    MarcsMac:cmis141 marcroberts$ javac RandomNumbers.java
    RandomNumbers.java:21: cannot find symbol
    symbol : variable answer
    location: class RandomNumbers
    if (one + two + three == answer)
    ^
    Here is my code:


    import javax.swing.JOptionPane;

    public class RandomNumbers {
    public static void main (String[] args) {

    //Generate three random numbers
    int one, two, three;
    one = (int)(Math.random()*(10));
    two = (int)(Math.random()*(10));
    three = (int)(Math.random()*(10));

    //What is the sum of these numbers
    String sumOfNumbersString =
    JOptionPane.showInputDialog(null,"What is the sum of " + one + "+" +
    two + "+" + three + "?");

    //Convert string to int
    int sumOfNumbers =Integer.parseInt(sumOfNumbersString);

    //Check the answer and Display Results
    if (one + two + three == answer)
    JOptionPane.showMessageDialog(null, "You are Correct!");
    else
    JOptionPane.showMessageDialog(null, "Sorry, that is Incorrect \n" +
    one + "+" + two + "+" + three + " equals " + (one + two + three));

    }
    }


  2. #2
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    Default Re: Can't fix my own errors

    Did you bother to read the error message? It says that it can not find the variable called answer. I can't either. Can you?

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

    mrroberts2u (April 14th, 2011)

  4. #3
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    Wink Re: Can't fix my own errors

    Ok so, I got the right code finally


    mport javax.swing.JOptionPane;

    public class RandomNumbers {
    public static void main (String[] args) {

    //Generate three random numbers
    int one, two, three;
    one = (int)(Math.random()*(10));
    two = (int)(Math.random()*(10));
    three = (int)(Math.random()*(10));

    //What is the sum of these numbers
    String sumOfNumbersString =
    JOptionPane.showInputDialog(null,"What is the sum of " + one + "+" +
    two + "+" + three + "?");

    //Convert string to int
    int sumOfNumbers =Integer.parseInt(sumOfNumbersString);

    //Check the answer and Display Results
    if (one + two + three == answer)
    JOptionPane.showMessageDialog(null, "You are Correct!");
    else
    JOptionPane.showMessageDialog(null, "Sorry, that is Incorrect \n" +
    one + "+" + two + "+" + three + " equals " + (one + two + three));

    }
    }


    I simply changed == answer to sumOfNumbers and all worked wonderfully!!

  5. #4
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    Default Re: Can't fix my own errors

    Quote Originally Posted by mrroberts2u View Post
    Ok so, I got the right code finally
    ...
    I simply changed == answer to sumOfNumbers and all worked wonderfully!!
    So why don't you post the corrected code? Why post the bad code again?

  6. #5
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    Default Re: Can't fix my own errors

    import javax.swing.JOptionPane;

    public class RandomNumbers {
    public static void main (String[] args) {

    //Generate three random numbers
    int one, two, three;
    one = (int)(Math.random()*(10));
    two = (int)(Math.random()*(10));
    three = (int)(Math.random()*(10));

    //What is the sum of these numbers
    String sumOfNumbersString =
    JOptionPane.showInputDialog(null,"What is the sum of " + one + "+" +
    two + "+" + three + "?");

    //Convert string to int
    int sumOfNumbers =Integer.parseInt(sumOfNumbersString);

    //Check the answer and Display Results
    if (one + two + three == sumOfNumbers)
    JOptionPane.showMessageDialog(null, "You are Correct!");
    else
    JOptionPane.showMessageDialog(null, "Sorry, that is Incorrect \n" +
    one + "+" + two + "+" + three + " equals " + (one + two + three));

    }
    }

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