Just as a general hint: forget books that tell you that you learn a massive language like java, C++, C# in X days if X is smaller than 49
You just won't, no mather what you do. You at best get a brief overview which in the end harms more than it helps.
Granted, you wont remember a whole lot of stuff from a book, but if 20% of it sinks in, thats still quite a bit learnt.
I keep books like that for the auld pap housing, when learning C++ myself, I always had a 'How to teach a ginger C++ in 24 hours', and even though I never had it by my side when at a PC, it still helped.
What I did have by my side was C++: A Complete Reference, by a bloke called Herbert Schildt, and used this, inconjunction with BlitzPlus, to write userlibs. Sure damn beat crappy little console apps! :D
Sad that there are no head first books for C, at least I don't think so. If they are, they are definitely the more or less best resource to learn it. (I've 3 of them and they are great and will teach it in a way that takes care you learned it without beeing dry and useless or usefull at best as a "check back compendium")
Herbert Schildt's C++ reference book comes in two sections, the first section is about C, and C only, the second section expands upon it by showing you the aspects that make the language C++. This was excellent in a sense that, yes, you learnt C, which is enough for anyone, but when you hit the OOP, you were instantly geared up for it. Which was nice! :D