I highly recommend 'The C Programming Language' by Kernighan and Ritchie.
These are the guys who invented the C language. This is the book I started with and will teach all the basics on using C and the only one I still refer to. Most of the other C books I've bought just take up space in the bookcase.
I also suggest to learn use plain 'C' correctly first. Kernighan and Ritchie's book is the best start.