[QZ#1] Overriding addDifferentSigns

[TFloyd1989]

[QZ#1] Overriding addDifferentSigns

[TFloyd1989]

I wasn't too sure how to implement it, I'm planning on coming to office hours today at 2:30 to discuss it in more detail as well

[lujiaying]

Could you provide the code snippet to make the question more clear?
I can hardly reproduce the error with limited information provided.

[TFloyd1989]

[TFloyd1989]

Included are both versions of the addDifferentsign, as well as the error message when I try to run add. I have also included a screenshot of the longintegerquiztest errors.

[lujiaying]

@TFloyd1989 thanks for the screenshots.

From the first screenshot, error in L28 could be due to:

LongInteger a = new LongInteger("123");  //change LongIntegerQuiz to LongInteger

Please pay more attention to these kinds of errors caused by typos. And try to fix all similar typos.

I also encourage you to read carefully about the error logs. I believe some bugs can be fixed by yourself after reading them.

[TFloyd1989]

Thank you, however, that was the state of the file after I downloaded it from the textbook. Specifically, it said LongIntegerQuiz rather than longinteger.

[lujiaying]

@TFloyd1989 Sorry. I have not went through the quiz1. So my previous response was indeed wrong. Please give me some time to figure out myself and then reach back to you.

Thanks.

[TFloyd1989]

Oh okay, no problem and thank you for the help!

[lujiaying]

From the first screenshot, error in L28 could be due to:

The constructor function that specifically has one input String argument is not implemented for LongIntegerQuiz.

We can mimic (not copy; also please try the super() trick) the constructor function in LongInteger.java to implement our own constructor function.

   /**
     * Creates a long integer by copying the specific object.
     * @param n the object to be copied.
     */
    public LongInteger(LongInteger n) {
        super(n.sign);
        digits = Arrays.copyOf(n.digits, n.digits.length);
    }

    /**
     * Creates a long integer with the specific sign and values.
     * @param n the sign and values to be set.
     * @see #set(String)
     */
    public LongInteger(String n) {
        set(n);
    }

[lujiaying]

@TFloyd1989 does it solve the issue?

[TFloyd1989]

My code appears to match the one above word for word now that I'm looking at it

[jdchoi77]

@TFloyd1989 as we talked about this over the office hour, please let me know if it becomes the issue after you create constructors for LongIntegerQuiz. Thanks.