Thread: InfiniteInt and Doublely Linked List, trying to add two together

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should return 555,333,333 but it gives me 555,333,777.

It looks like the 222 was added to the last group instead of being subtracted.
Is the sign being lost?

Can you post the console's contents that shows what you are asking about?
Add some comments (<<<<< HERE) to mark and describe where the issue is.

I'm not sure if im using the negative signs correctly

Probably not. How are you trying to debug the code to see where the problem is?

Work on one problem at a time. Pick one of the cases where the code fails and do some debugging to see why it doesn't get the desired results.
For debugging, I use print statements to show the values of variables as they are used and their values are changed.

Make a test case that only does one call to add with parameters that are not being added correctly.

Comments on the code:
There are a lot of places where the code is not properly formatted. The indentations of statements and the alignment of { and } don't show the logical nesting of statements making the code harder to read and understand.
There are very few comments in the add() method.