Let us C by Yashavant P. Kanetkar
It is a great book to anyone who has a slightest interest in C programming .
I on the other only am reading the first chapter only lol, actually it was really hard to find the pdf of this book cause since this book is used in many colleges as a textbook its retail price is really not realistic or should I say the most overpriced book in the field , but still it is worth it :) in my opinion ..