labisso: You aren't wasting your money with that book. However, do make sure you get the second edition. The C Programming Langauge, 2nd Edition, by Kernighan and Ritchie is truly one of the best books I've ever read. It manages to capture all of the elegance, power, and efficiency of the C langauge and explain it accordingly.

It isn't an introduction to programming type book, however. It assumes that you are either comfortable with programming logic, or have access to a friend who is. If you are already comfortable with a different language, though, I know of no better book to learn C from.

Other recommendations, would be The Practice of Programming, by Kernighan and Pike. It has a wealth of tips, suggestions, hints, and good knowledge. The kind of stuff that really helps when you're programming.