C Tutorial/Language/Header Files — различия между версиями
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Содержание
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
- Each function in the C standard library has its associated header.
- The headers are included using #include.
- Header Including obtains the Declarations for the standard library functions.
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
#include <stdio.h>
int main(void)
{
printf("\nBe careful!!\a");
return 0;
}Be careful!!
Include the header file for input and output
#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;
}A
B 1. A
2. A
3. A
A
Macros in Headers
To force the compiler to use the real function: undefine the macro name using #undef.
#undef abs