I decided a while ago that I didn't have a good enough grounding in C++, so I ended up getting a book called the 3rd edition of "C++ Primer" by Stanley B. Lippman and Josée Lajoie from a library at Purdue. It was sitting in my apartment for a while, since I had a lot going on in my life at the time, but I can have it indefinitely, as long as I remember to renewing it online.
