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      C Standard Library headers

      From cppreference.com
      <c
       
       
       

      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]
      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 andalignof 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.

      #HeaderMacro nameValue
      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 forStandard Library headers
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