Standard Header Files

1.15 Standard Header Files

All function prototypes, macros, and types in the ANSI library are contained in one or more of the following standard header files:

assert.h 
inttypes.h(*)
signal.h
stdlib.h
complex.h(*)
iso646.h(*)
stdarg.h
string.h
ctype.h
limits.h
stdbool.h(*)
tgmath.h(*)
errno.h
locale.h
stddef.h
time.h
fenv.h(*)
math.h
stdint.h(*)
wchar.h(*)
float.h
setjmp.h
stdio.h
wctype.h(*)

Because a standard "function" may also be implemented as a macro, your source files should contain no other declaration of a function once the appropriate header file has been included.

Table 1-22 describes some commonly used types. The table also lists which header files define each type.

Table 1-22. Commonly used types

Type

Purpose

Header files

size_t

Used to express the size of an object as a number of bytes (generally equivalent to unsigned int)

stddef.h, stdio.h
wchar_t

Used to hold multi-byte character codes, and large enough to represent the codes of all extended character sets

stdlib.h, wchar.h(*)
wint_t(*)

An integer type used to represent wide characters, including the macro WEOF

wchar.h(*)
ptrdiff_t

Used to represent the difference of two pointers (usually equivalent to int)

stddef.h

 



C Pocket Reference
C Pocket Reference
ISBN: 0596004362
EAN: 2147483647
Year: 2002
Pages: 29

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