C Programming/Standard Library Reference
Headers
ANSI C (C89)/ISO C (C90)
| assert.h | Verify program assertion file |
| ctype.h | Character types file. |
| errno.h | System error numbers file |
| float.h | Floating types file |
| limits.h | Implementation-defined constants file. |
| locale.h | Category macros file. |
| math.h | Mathematical declarations file. |
| setjmp.h | Stack environment declarations file. |
| signal.h | Signals file. |
| stdarg.h | Handle variable argument list file. |
| stddef.h | Standard type definitions file. |
| stdio.h | Standard buffered input/output file. |
| stdlib.h | Standard library definitions file. |
| string.h | String operations file. |
| time.h | Time types file. |
ISO C (C94/C95), Amendment 1 (AMD1)
Very old compilers may not include some or all of these headers
| iso646.h | Alternative spellings. |
| wchar.h | Wide-character handling. |
| wctype.h | Wide-character classification and mapping utilities. |
ISO C (C99)
These are supported only in newer compilers
| complex.h | Complex arithmetic. |
| fenv.h | Floating-point environment. |
| inttypes.h | Fixed size integer types. |
| stdbool.h | Boolean type and values. |
| stdint.h | Integer types. |
| tgmath.h | Type-generic macros. |
ISO C (C11)
These are supported only in newer compilers
| stdalign.h | Alignment keywords and macros. |
| stdatomic.h | Atomic operations on data shared between threads. |
| stdnoreturn.h | _Noreturn function specifier macro. |
| threads.h | Support for multiple threads of execution. |
| uchar.h | Types and functions for manipulating Unicode characters. |
Table of functions
This table also includes function-like macros