? 28-128: I understand that this block of code is unfinished and that you may have intended for future students to work off this code. That being said, you should add multiple comments on what certain blocks of code are doing/attempting to do. Maybe you should add a //TODO... comment.

Those blocks with multple comment-outs, "//", could be replaced with /* ... */
This makes it easier for students to work with the code, as deleting multiple "//" symbols is time consuming and inefficient.