C Standard Library header files

< c
<assert.h> Conditionally compiled macro that compares its argument to zero
<complex.h> (since C99) Complex number arithmetic
<ctype.h> Functions to determine the type contained in character data
<errno.h> Macros reporting error conditions
<fenv.h> (since C99) Floating-point environment
<float.h> Limits of float types
<inttypes.h> (since C99) Format conversion of integer types
<iso646.h> (since C95) Alternative operator spellings
<limits.h> Sizes of basic types
<locale.h> Localization utilities
<math.h> Common mathematics functions
<setjmp.h> Nonlocal jumps
<signal.h> Signal handling
<stdalign.h> (since C11) alignas and alignof convenience macros
<stdarg.h> Variable arguments
<stdatomic.h> (since C11) Atomic types
<stdbool.h> (since C99) Boolean type
<stddef.h> Common macro definitions
<stdint.h> (since C99) Fixed-width integer types
<stdio.h> Input/output
<stdlib.h> General utilities: memory management, program utilities, string conversions, random numbers
<stdnoreturn.h> (since C11) noreturn convenience macros
<string.h> String handling
<tgmath.h> (since C99) Type-generic math (macros wrapping math.h and complex.h)
<threads.h> (since C11) Thread library
<time.h> Time/date utilities
<uchar.h> (since C11) UTF-16 and UTF-32 character utilities
<wchar.h> (since C95) Extended multibyte and wide character utilities
<wctype.h> (since C95) Functions to determine the type contained in wide character data


  • C11 standard (ISO/IEC 9899:2011):
  • 7 Library (p: 180-457)
  • C99 standard (ISO/IEC 9899:1999):
  • 7 Library (p: 164-402)
  • C89/C90 standard (ISO/IEC 9899:1990):

See also