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  2. C mathematical functions - Wikipedia

    en.wikipedia.org/wiki/C_mathematical_functions

    The functions that operate on integers, such as abs, labs, div, and ldiv, are instead defined in the <stdlib.h> header (<cstdlib> header in C++). Any functions that operate on angles use radians as the unit of angle. [1] Not all of these functions are available in the C89 version of the standard. For those that are, the functions accept only ...

  3. Cmath - Wikipedia

    en.wikipedia.org/wiki/Cmath

    The cmath header file in C++, alias of math.h. cmath ( c omplex math ) is a library for Python ( cmath.sqrt(-1) for example results in 1j ) CMath , abbreviation of the chartered mathematician title offered by the Institute of Mathematics and its Applications .

  4. errno.h - Wikipedia

    en.wikipedia.org/wiki/Errno.h

    errno.h is a header file in the standard library of the C ... A parameter was outside a function's domain, e.g. sqrt (-1) ERANGE: A result outside a function's range ...

  5. C++ Standard Library - Wikipedia

    en.wikipedia.org/wiki/C++_Standard_Library

    The C headers <stdnoreturn.h> and <threads.h> do not have C++ equivalents and their C headers are not supported in C++. C++ does not provide the C POSIX library as part of any standard, however it is legal to use in a C++ program. If used in C++, the POSIX headers are not prepended with a "c" at the beginning of the name, and all contain the .h ...

  6. Include directive - Wikipedia

    en.wikipedia.org/wiki/Include_directive

    The C++ standard library is similar, but the declarations may be provided by the compiler without reading an actual file. C standard header files are named with a .h file name extension, as in #include <stdio.h>. Typically, custom C header files have the same extension. Custom C++ header files tend to have more variety of extensions, including ...

  7. C POSIX library - Wikipedia

    en.wikipedia.org/wiki/C_POSIX_library

    The C POSIX library is a specification of a C standard library for POSIX systems. It was developed at the same time as the ANSI C standard. Some effort was made to make POSIX compatible with standard C; POSIX includes additional functions to those introduced in standard C. On the other hand, the 5 headers that were added to the C standard ...

  8. C standard library - Wikipedia

    en.wikipedia.org/wiki/C_standard_library

    Each header file contains one or more function declarations, data type definitions, and macros. After a long period of stability, three new header files (iso646.h, wchar.h, and wctype.h) were added with Normative Addendum 1 (NA1), an addition to the C Standard ratified in 1995.

  9. Integer square root - Wikipedia

    en.wikipedia.org/wiki/Integer_square_root

    The private function takes a normalized input, divides the input bits in half, passes the most-significant half of the input recursively to the private function, and performs some integer operations on the output of that recursive call and the least-significant half of the input to get the normalized output, which it returns.