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(libc.info)Language Features

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C Language Facilities in the Library
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   Some of the facilities implemented by the C library really should be
thought of as parts of the C language itself.  These facilities ought to
be documented in the C Language Manual, not in the library manual; but
since we don't have the language manual yet, and documentation for these
features has been written, we are publishing it here.

Consistency Checking

Using `assert' to abort if

something ``impossible'' happens.

Variadic Functions

Defining functions with varying numbers

of args.

Null Pointer Constant

The macro `NULL'.

Important Data Types

Data types for object sizes.

Data Type Measurements

Parameters of data type representations.