Quick introduction, written by a novice, intended for use by novices, but assumes familiarity with a programming language. By Greg Goebel. Public domain.

A web site to teach the basics of the C programming language as defined by ANSI/ISO. (C99)

A mature C/C++ tutorial, designed to improve your knowledge of the language itself.

Guide with examples.

Set of styles and guidelines written by two technical consultants for IBM.

By Ian Cooke. Highlights the differences with C++ including comments, input/output, memory allocation, variable declarations, constants, structures, booleans, libraries and suggested reading.

By Ray Tayek. Introduction to the subset of C++ and differences between the languages including scope, data structures, function behavior, library functions, input/output and compiling.

Easy to understand C tutorials for absolute beginners.

A tutorial that starts with the very basic and ends with the very complex.

Covers the basics of input/output, string functions and explanations of basic data types and operators.