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==Common Headers ==

Header
Purpose
assert.h
Defines the assert() macro
ctype.h
Character handling
errno.h
Error reporting
float.h
Defines implementation-dependent floating-point limits
limits.h
dependent limits
locale.h
Localization
math.h
math library
setjmp.h
Nonlocal jumps
signal.h
Signal handling
stdarg.h
Variable argument lists
stddef.h
Constants
stdio.h
I/O system
stdlib.h
Miscellaneous declarations
string.h
string functions
time.h
system time functions
From
C: The Complete Reference, Fourth Edition
by Herbert Schildt
McGraw-Hill/Osborne 2000

==Headers==

<OL><LI>Each function in the C standard library has its associated header.</LI><LI>The headers are included using #include.</LI><LI>Header Including obtains the Declarations for the standard library functions.</LI></OL>
1.17.Header Files
1.17.1.
<A href="/Tutorial/C/0020__Language/Includeheaderfile.htm">Include header file</a>
1.17.2.
<A href="/Tutorial/C/0020__Language/Includetheheaderfileforinputandoutput.htm">Include the header file for input and output </a>
1.17.3.
Headers
1.17.4.
<A href="/Tutorial/C/0020__Language/CommonHeaders.htm">Common Headers </a>
1.17.5.
<A href="/Tutorial/C/0020__Language/HeadersAddedbyC99.htm">Headers Added by C99</a>
1.17.6.
<A href="/Tutorial/C/0020__Language/MacrosinHeaders.htm">Macros in Headers</a>

==Headers Added by C99==

Header
Purpose
complex.h
complex arithmetic.
fenv.h
Gives access to the floating-point status flags and other aspects of the floating-point environment.
inttypes.h
Defines a standard, portable set of integer type names. Also supports functions that handle greatest-width integers.
iso646.h
Added in 1995 by Amendment 1. Defines macros that correspond to various operators, such as && and ^.
stdbool.h
Supports Boolean data types. Defines the macro bool, which helps with C++ compatibility.
stdint.h
Defines a standard, portable set of integer type names. This file is included by <inttypes.h>.
tgmath.h
Defines type-generic floating-point macros.
wchar.h
multibyte and wide-character functions.
wctype.h
multibyte and wide-character classification functions.
From
C: The Complete Reference, Fourth Edition
by Herbert Schildt
McGraw-Hill/Osborne 2000

==Include header file==

<source lang="cpp">#include <stdio.h>
int main(void)
{
printf("\nBe careful!!\a");
return 0;
}</source>
<pre class=codeResult>Be careful!!</pre>

==Include the header file for input and output ==

<source lang="cpp">#include <stdio.h>
int main(void)
{
printf("A\n\n\nB");
printf("\t1.\tA \n");
printf("\t2.\tA \n");
printf("\t3.\tA \n");
printf("\n\t\t\b\bA\n\n");
return 0;
}</source>
<pre class=codeResult>A

B 1. A
2. A
3. A

A</pre>

==Macros in Headers==

To force the compiler to use the real function: undefine the macro name using #undef.

<source lang="cpp">#undef abs</source>

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