[Nil]

Just wondering where subtraction and division come into play? Since expressions could be more than adding or multiplying.

Also, I know Java better than C, but I should be fine understanding the C code anyway. I don't mind having to figure things out.

Good question with sub and div, I didn't really draw this out as clearly as I should have. I defined mult-op as multiply, divide, and modulo and add-op as add and subtract, doing it this way just makes it cleaner, not having 5 symbols (or even worse, 5 cases) in the grammar.

Oh okay. That makes a lot more sense now.