I am surprised to see nobody mention Practical C Programming (https://www.amazon.com/Practical-Programming-Does-Nutshell-H...) by Steve Oualline. Before I studied computer science in school, I read this book and successfully taught myself C. Readers here may consider it to be a bit remedial, but if you’re struggling to understand the other recommended books, start here. I attempted to read K&R half a dozen times back then, unsuccessfully. Looking back at it now, I can see why: K&R’s examples are hard for true beginners to wrap their minds around. I now teach C as a part of an upper level undergraduate course; the key to understanding most of C’s counterintuitive behavior is to have a clear understanding of its relationship with memory. In fact, I quite like C. It is simple and elegant in many ways. It is also just super unsafe.

"practical c programming" is not bad: http://amzn.to/m6SOB5