| Header | Purpose |
| complex.h | complex arithmetic. |
| fenv.h | Gives access to the floating-point status flags and other aspects of the floating-point environment. |
| inttypes.h | Defines a standard, portable set of integer type names. Also supports functions that handle greatest-width integers. |
| iso646.h | Added in 1995 by Amendment 1. Defines macros that correspond to various operators, such as && and ^. |
| stdbool.h | Supports Boolean data types. Defines the macro bool, which helps with C++ compatibility. |
| stdint.h | Defines a standard, portable set of integer type names. This file is included by . |
| tgmath.h | Defines type-generic floating-point macros. |
| wchar.h | multibyte and wide-character functions. |
| wctype.h | multibyte and wide-character classification functions. |
