Programming in C

B The Standard C Library

B The Standard C Library

THE STANDARDC LIBRARY CONTAINSa large selection of functions that might be

called from a C program.This section does not list all of these functions, but rather most

of the more commonly used ones. For a complete listing of all the functions that are

available, consult the documentation that was included with your compiler, or check one

of the resources listed in Appendix E, “Resources.”

Among the routines not described in this appendix are ones for manipulating the date

and time (such as time,ctime,and localtime), performing nonlocal jumps (setjmpand

longjmp), generating diagnostics (assert), handling a variable number of arguments

(va_list,va_start,va_arg,and va_end), handling signals (signaland raise), dealing

with localization (as defined in <locale.h>), and dealing with wide character strings.

Standard Header Files

This section describes the contents of some standard header files:<stddef.h>,

<stdbool.h>,<limits.h>,<float.h>,and <stdinit.h>.

<stddef.h>

This header file contains some standard definitions, such as the following:

Define Meaning

NULL A null pointer constant

offsetof (structure, member) The offset in bytes of the member member

from the start of the structure structure; the

type of the result is size_t

ptrdiff_t The type of integer produced by subtracting

two pointers

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