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{{c title|Standard Library}}
 
 
The '''C standard library''' is a [[standard library|standardized collection]] of headers and library functions for the [[C|C programming language]]. The library provides a set of commonly used macros, type definitions, and functions to perform common tasks such as [[string manipulation|string handling]], [[IO processing|input/output processing]], [[memory allocation]], [[math computations]], [[thread management]], and various other common services.
 
The '''C standard library''' is a [[standard library|standardized collection]] of headers and library functions for the [[C|C programming language]]. The library provides a set of commonly used macros, type definitions, and functions to perform common tasks such as [[string manipulation|string handling]], [[IO processing|input/output processing]], [[memory allocation]], [[math computations]], [[thread management]], and various other common services.
  
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Standard C provides 29 standard headers. The headers may be included in any order. The headers may also be included more than once - the effect of that is as if it was only included once. All standard C functions have external linkage.
 
Standard C provides 29 standard headers. The headers may be included in any order. The headers may also be included more than once - the effect of that is as if it was only included once. All standard C functions have external linkage.
  
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{{collist
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{| style="width: 600px; margin-left: auto; margin-right: auto;"
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| count  = 5
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|<[[assert.h]]>
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| center = yes
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|<[[complex.h]]>
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| width = 650px
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|<[[ctype.h]]>
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|
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|<[[errno.h]]>
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* {{c header|assert.h}}
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|<[[fenv.h]]>
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* {{c header|complex.h}}
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|-
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* {{c header|ctype.h}}
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|<[[float.h]]>
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* {{c header|errno.h}}
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|<[[inttypes.h]]>
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* {{c header|fenv.h}}
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|<[[iso646.h]]>
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* {{c header|float.h}}
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|<[[limits.h]]>
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* {{c header|inttypes.h}}
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|<[[locale.h]]>
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* {{c header|iso646.h}}
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|-
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* {{c header|limits.h}}
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|<[[math.h]]>
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* {{c header|locale.h}}
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|<[[setjmp.h]]>
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* {{c header|math.h}}
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|<[[signal.h]]>
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* {{c header|setjmp.h}}
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|<[[stdalign.h]]>
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* {{c header|signal.h}}
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|<[[stdarg.h]]>
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* {{c header|stdalign.h}}
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|-
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* {{c header|stdarg.h}}
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|<[[stdatomic.h]]>
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* {{c header|stdatomic.h}}
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|<[[stdbool.h]]>
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* {{c header|stdbool.h}}
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|<[[stddef.h]]>
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* {{c header|stddef.h}}
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|<[[stdint.h]]>
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* {{c header|stdint.h}}
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|<[[stdio.h]]>
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* {{c header|stdio.h}}
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|-
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* {{c header|stdlib.h}}
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|<[[stdlib.h]]>
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* {{c header|stdnoreturn.h}}
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|<[[stdnoreturn.h]]>
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* {{c header|string.h}}
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|<[[string.h]]>
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* {{c header|tgmath.h}}
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|<[[tgmath.h]]>
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* {{c header|threads.h}}
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|<[[threads.h]]>
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* {{c header|time.h}}
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|-
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* {{c header|uchar.h}}
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|<[[time.h]]>
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* {{c header|wchar.h}}
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|<[[uchar.h]]>
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* {{c header|wctype.h}}
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|<[[wchar.h]]>
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}}
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|<[[wctype.h]]>
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|}
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== Optional headers ==
 
== Optional headers ==
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3 of the 29 standard headers are optional:
 
3 of the 29 standard headers are optional:
  
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* {{C|complex.h|<complex.h>}}
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* <[[complex.h]]>
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* {{C|stdatomic.h|<stdatomic.h>}}
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* <[[stdatomic.h]]>
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* {{C|threads.h|<threads.h>}}
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* <[[threads.h]]>
  
 
While implementations are encouraged to support those headers, they are not required to.
 
While implementations are encouraged to support those headers, they are not required to.
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! Header Name !! Since !! Description
 
! Header Name !! Since !! Description
 
|-
 
|-
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|{{C|assert.h|<assert.h>}} || C89 || Provides a set of assertion macros used in assisting  with debugging and detecting logic errors.
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|<[[assert.h]]> || C89 || Provides a set of assertion macros used in assisting  with debugging and detecting logic errors.
 
|-
 
|-
−
|{{C|complex.h|<complex.h>}} || C99 || Provides a set of functions used to manipulate complex numbers.
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|<[[complex.h]]> || C99 || Provides a set of functions used to manipulate complex numbers.
 
|-
 
|-
−
|{{C|ctype.h|<ctype.h>}} || C89 || Provides a set of functions used for classifying characters.
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|<[[ctype.h]]> || C89 || Provides a set of functions used for classifying characters.
 
|-
 
|-
−
|{{C|errno.h|<errno.h>}} || C89 || Provides a set of predefined values for {{C|errno}}.
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|<[[errno.h]]> || C89 || Provides a set of predefined values for [[errno (C)|errno]].
 
|-
 
|-
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|{{C|fenv.h|<fenv.h>}} || C99 || Provides a set of functions for controlling the floating-point environment.
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|<[[fenv.h]]> || C99 || Provides a set of functions for controlling the floating-point environment.
 
|-
 
|-
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|{{C|float.h|<float.h>}} || C89 || Provides a set of macros defining the implementation of the floating-point environment.
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|<[[float.h]]> || C89 || Provides a set of macros defining the implementation of the floating-point environment.
 
|-
 
|-
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|{{C|inttypes.h|<inttypes.h>}} || C99 || Provides a set of exact width integer types.
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|<[[inttypes.h]]> || C99 || Provides a set of exact width integer types.
 
|-
 
|-
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|{{C|iso646.h|<iso646.h>}} || NA1 || Provides a set of macros that implement an alternative way of expressing various C operators
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|<[[iso646.h]]> || NA1 || Provides a set of macros that implement an alternative way of expressing various C operators
 
|-
 
|-
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|{{C|limits.h|<limits.h>}} || C89 || Provides a set of macros specifying the implementation-specific limits of the integer types.
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|<[[limits.h]]> || C89 || Provides a set of macros specifying the implementation-specific limits of the integer types.
 
|-
 
|-
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|{{C|locale.h|<locale.h>}} || C89 || Provides a set of functions localization functions
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|<[[locale.h]]> || C89 || Provides a set of functions localization functions
 
|-
 
|-
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|{{C|math.h|<math.h>}} || C89 || Provides a set of common mathematical functions.
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|<[[math.h]]> || C89 || Provides a set of common mathematical functions.
 
|-
 
|-
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|{{C|setjmp.h|<setjmp.h>}} || C89 || Provides macros to perform non-local jump operators.
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|<[[setjmp.h]]> || C89 || Provides macros to perform non-local jump operators.
 
|-
 
|-
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|{{C|signal.h|<signal.h>}} || C89 || Provides a set of signal handling functions.
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|<[[signal.h]]> || C89 || Provides a set of [[signal handling]] functions.
 
|-
 
|-
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|{{C|stdalign.h|<stdalign.h>}} || C11 || Provides a set of macros for working with object alignments.
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|<[[stdalign.h]]> || C11 || Provides a set of macros for working with [[object alignments]].
 
|-
 
|-
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|{{C|stdarg.h|<stdarg.h>}} || C89 || Provides a set of macros for working with variadic functions
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|<[[stdarg.h]]> || C89 || Provides a set of macros for working with [[variadic function]]s
 
|-
 
|-
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|{{C|stdatomic.h|<stdatomic.h>}} || C11 || Provides a set of functions for performing atomic operations on data.
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|<[[stdatomic.h]]> || C11 || Provides a set of functions for performing [[atomic operations]] on data.
 
|-
 
|-
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|{{C|stdbool.h|<stdbool.h>}} || C99 || Provides boolean macros.
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|<[[stdbool.h]]> || C99 || Provides [[boolean]] macros.
 
|-
 
|-
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|{{C|stddef.h|<stddef.h>}} || C89 || Provides a set of commonly used type definitions within the standard library.
+
|<[[stddef.h]]> || C89 || Provides a set of commonly used type definitions within the standard library.
 
|-
 
|-
−
|{{C|stdint.h|<stdint.h>}} || C99 || Provides a set of exact width integer types.
+
|<[[stdint.h]]> || C99 || Provides a set of exact width integer types.
 
|-
 
|-
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|{{C|stdio.h|<stdio.h>}} || C89 || Provides a set of standard input/output processing functions.
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|<[[stdio.h]]> || C89 || Provides a set of standard input/output processing functions.
 
|-
 
|-
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|{{C|stdlib.h|<stdlib.h>}} || C89 || Provides core library functions such as memory management and random number generation.
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|<[[stdlib.h]]> || C89 || Provides core library functions such as memory management and random number generation.
 
|-
 
|-
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|{{C|stdnoreturn.h|<stdnoreturn.h>}} || C11 || Provides a macro for specifying non-returning functions.
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|<[[stdnoreturn.h]]> || C11 || Provides a macro for specifying [[non-returning functions]].
 
|-
 
|-
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|{{C|string.h|<string.h>}} || C89 || Provides a set of string handling|string handling functions.
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|<[[string.h]]> || C89 || Provides a set of [[string handling|string handling functions]].
 
|-
 
|-
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|{{C|tgmath.h|<tgmath.h>}} || C99 || Provides a set of type-generic math functions.
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|<[[tgmath.h]]> || C99 || Provides a set of type-generic math functions.
 
|-
 
|-
−
|{{C|threads.h|<threads.h>}} || C11 || Provides a set of thread management functions.
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|<[[threads.h]]> || C11 || Provides a set of [[thread management]] functions.
 
|-
 
|-
−
|{{C|time.h|<time.h>}} || C89 || Provides a set of date and time handling functions.
+
|<[[time.h]]> || C89 || Provides a set of [[date and time handling]] functions.
 
|-
 
|-
−
|{{C|uchar.h|<uchar.h>}} || C11 || Provides a set of Unicode character manipulation functions.
+
|<[[uchar.h]]> || C11 || Provides a set of [[Unicode]] character manipulation functions.
 
|-
 
|-
−
|{{C|wchar.h|<wchar.h>}} || NA1 || Provides a set of wide string handling|string handling functions.
+
|<[[wchar.h]]> || NA1 || Provides a set of wide [[string handling|string handling functions]].
 
|-
 
|-
−
|{{C|wctype.h|<wctype.h>}} || NA1 || Provides a set of functions used for classifying wide characters.
+
|<[[wctype.h]]> || NA1 || Provides a set of functions used for classifying wide characters.
 
|}
 
|}
  
 
== Embedded C ==
 
== Embedded C ==
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{{main|c/embedded|l1=Embedded C}}
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{{main|Embedded C}}
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Embedded C introduced two optional headers {{C|stdfix.h|<stdfix.h>}} and  {{C|iohw.h|<iohw.h>}}. The headers not formally part of the standard library.
+
Embedded C introduced two optional headers [[stdfix.h - C|<stdfix.h>]] and  [[iohw.h - C|<iohw.h>]]. The headers not formally part of the standard library.
  
 
== See also ==
 
== See also ==

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