Learn C The Hard Way
by Zed A. Shaw
Publisher: LCodeTHW 2011
A clear and direct introduction to modern C programming. The purpose of this book is to get you strong enough in C that you'll be able to write your own software in it, or modify someone else's code. The text is not for beginners, but for people who have at least read Learn Python The Hard Way or know one other programming language.
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by Jens Gustedt - ICube
The book introduces you to the very basics of programming with C, details most principal concepts and features such as control structures, data types, operators and functions, fully explains pointers, performance, reentrancy, atomicity, threads, etc.
This online wiki book is a quick and easy introduction to the ANSI C programming language. It is written by a novice, and is intended for use by a novice. However, it does assume some familiarity with a programming language.
by Sandra Loosemore, at al. - Free Software Foundation, Inc.
The GNU C library, described in this document, defines all of the library functions that are specified by the ISO C standard, as well as additional features specific to POSIX. This manual tells you how to use the facilities of the GNU library.
by JT Kalnay - Smashwords
The author included example programs that exhaustively illustrate the important points of C. By working through these programs you can teach yourself C. It is assumed that you already know how to program and are familiar with standard algorithms.