Standard C header file

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On April 9, 1995, normative Addendum 1 (Na1) approved the addition of the three header files (iso646.h, wchar. H, and wctype. h) to the C standard function library. The c99 standard adds six header files (complex. H, fenv. H, inttypes. H, stdbool. H, stdint. H, and tgmath. h ). The C11 standard also adds 5 header files (stdalign. H, stdatomic. H, stdnoreturn. H, threads. H, and uchar. h ). So far, the C standard function library has a total of 29 header files:

Name	Source	Description
<Assert. h>		Contains the assert macro, used to assist with detecting logical errors and other types of bug in debugging versions of a program.
<Complex. h>	C99	A set of functions for manipulating plural.
<Ctype. h>		Defines set of functions used to classify characters by their types or to convert between upper and lower case in a way that is independent of the used character set (typically ascii or one of its extensions, although implementations utilizing ebcdic are also known ).
<Errno. h>		For testing error codes reported by library functions.
<Fenv. h>	C99	Defines a set of functions for controlling floating point number environment.
<Float. h>		Defines macro constants specifying the implementation-specific properties of the Floating Point Library.
<Inttypes. h>	C99	Defines exact width integer types.
<Iso646.h>	Na1	Defines several macros that are equivalent to some of the operators in C. for programming in ISO 646 variant character sets.
<Limits. h>		Defines macro constants specifying the implementation-specific properties of the integer types.
<Locale. h>		Defines C localization functions.
<Math. h>		Defines C mathematical functions.
<Setjmp. h>		Declares the macrosSetjmpAndLongjmp, Which are used for non-local exits.
<Signal. h>		Defines C signal handling functions.
<Stdalign. h>	C11	For querying and specifying the data structure alignment of objects.
<Stdarg. h>		For accessing a varying number of arguments passed to functions.
<Stdatomic. h>	C11	For atomic operations on data shared between threads.
<Stdbool. h>	C99	Defines a boolean data type.
<Stddef. h>		Defines several useful types and macros.
<Stdint. h>	C99	Defines exact width integer types.
<Stdio. h>		Defines core Input and Output Functions
<Stdlib. h>		Defines numeric conversion functions, pseudo-random numbers generation functions, dynamicmemory allocation, process control functions
<Stdnoreturn. h>	C11	For specifying non-returning functions.
<String. h>		Defines C string handling functions.
<Tgmath. h>	C99	Defines type-generic mathematical functions.
<Threads. h>	C11	Defines functions for managing multiple threads as well as mutexes and condition variables.
<Time. h>		Defines date and time handling functions
<Uchar. h>	C11	Types and functions for manipulating Unicode characters.
<Wchar. h>	Na1	Defines wide string handling functions.
<Wctype. h>	Na1	Defines set of functions used to classify wide characters by their types or to convert between upper and lower case