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C Standard Library headers

From cppreference.com
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The interface of C standard library is defined by the following collection of headers.

Conditionally compiled macro that compares its argument to zero [edit]
Complex number arithmetic [edit]
Functions to determine the type contained in character data [edit]
Macros reporting error conditions [edit]
(C99)
Floating-point environment [edit]
Limits of floating-point types [edit]
Format conversion of integer types [edit]
Alternative operator spellings [edit]
Ranges of integer types [edit]
Localization utilities [edit]
Common mathematics functions [edit]
Nonlocal jumps [edit]
Signal handling [edit]
(since C11)(deprecated in C23)
alignas and alignof convenience macros[edit]
Variable arguments [edit]
Atomic operations [edit]
Macros to work with the byte and bit representations of types [edit]
(since C99)(deprecated in C23)
Macros for boolean type [edit]
Macros for performing checked integer arithmetic [edit]
Common macro definitions [edit]
Fixed-width integer types [edit]
Input/output [edit]
General utilities: memory management, program utilities, string conversions, random numbers, algorithms [edit]
(since C29)
Text transcode[edit]
(since C11)(deprecated in C23)
noreturn convenience macro[edit]
String handling [edit]
Type-generic math (macros wrapping <math.h> and <complex.h>)[edit]
Thread library [edit]
Time/date utilities [edit]
UTF-16 and UTF-32 character utilities [edit]
Extended multibyte and wide character utilities [edit]
Functions to determine the type contained in wide character data [edit]

[edit] Feature test macros (since C23)

Feature test macros are defined in corresponding headers respectively since C23. Note that not all headers contain such a macro.

# Header Macro name Value
1 <assert.h> __STDC_VERSION_ASSERT_H__ 202311L
2 <complex.h> __STDC_VERSION_COMPLEX_H__ 202311L
3 <ctype.h> N/A
4 <errno.h> N/A
5 <fenv.h> __STDC_VERSION_FENV_H__ 202311L
6 <float.h> __STDC_VERSION_FLOAT_H__ 202311L
7 <inttypes.h> __STDC_VERSION_INTTYPES_H__ 202311L
8 <iso646.h> N/A
9 <limits.h> __STDC_VERSION_LIMITS_H__ 202311L
10 <locale.h> N/A
11 <math.h> __STDC_VERSION_MATH_H__ 202311L
12 <setjmp.h> __STDC_VERSION_SETJMP_H__ 202311L
13 <signal.h> N/A
14 <stdalign.h> N/A
15 <stdarg.h> __STDC_VERSION_STDARG_H__ 202311L
16 <stdatomic.h> __STDC_VERSION_STDATOMIC_H__ 202311L
17 <stdbit.h> __STDC_VERSION_STDBIT_H__ 202311L
18 <stdbool.h> N/A
19 <stdckdint.h> __STDC_VERSION_STDCKDINT_H__ 202311L
20 <stddef.h> __STDC_VERSION_STDDEF_H__ 202311L
21 <stdint.h> __STDC_VERSION_STDINT_H__ 202311L
22 <stdio.h> __STDC_VERSION_STDIO_H__ 202311L
23 <stdlib.h> __STDC_VERSION_STDLIB_H__ 202311L
24 <stdmchar.h> __STDC_VERSION_STDMCHAR_H__ 2029??L
25 <stdnoreturn.h> N/A
26 <string.h> __STDC_VERSION_STRING_H__ 202311L
27 <tgmath.h> __STDC_VERSION_TGMATH_H__ 202311L
28 <threads.h> N/A
29 <time.h> __STDC_VERSION_TIME_H__ 202311L
30 <uchar.h> __STDC_VERSION_UCHAR_H__ 202311L
31 <wchar.h> __STDC_VERSION_WCHAR_H__ 202311L
32 <wctype.h> N/A

[edit] References

  • C23 standard (ISO/IEC 9899:2024):
  • 7.1.2 Standard headers (p: 191-192)
  • C17 standard (ISO/IEC 9899:2018):
  • 7.1.2 Standard headers (p: 131-132)
  • C11 standard (ISO/IEC 9899:2011):
  • 7.1.2 Standard headers (p: 181-182)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.1.2 Standard headers (p: 165)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.1.2 Standard headers

[edit] See also

C++ documentation for Standard Library headers

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