Путеводитель по Руководству Linux

  User  |  Syst  |  Libr  |  Device  |  Files  |  Other  |  Admin  |  Head  |



   fdiml    ( 3 )

положительная разница (positive difference)

Имя (Name)

fdim, fdimf, fdiml - positive difference

Синопсис (Synopsis)

#include <math.h>

double fdim(double x, double y); float fdimf(float x, float y); long double fdiml(long double x, long double y);

Link with -lm.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

fdimf(), fdiml(): _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L


Описание (Description)

These functions return the positive difference, max(x-y,0),
       between their arguments.

Возвращаемое значение (Return value)

On success, these functions return the positive difference.

If x or y is a NaN, a NaN is returned.

If the result overflows, a range error occurs, and the functions return HUGE_VAL, HUGE_VALF, or HUGE_VALL, respectively.


Ошибки (Error)

See math_error(7) for information on how to determine whether an
       error has occurred when calling these functions.

The following errors can occur:

Range error: result overflow errno is set to ERANGE. An overflow floating-point exception (FE_OVERFLOW) is raised.


Версии (Versions)

These functions first appeared in glibc in version 2.1.

Атрибуты (Attributes)

For an explanation of the terms used in this section, see
       attributes(7).

┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface Attribute Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │fdim(), fdimf(), fdiml() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘


Стандарты (Conforming to)

C99, POSIX.1-2001, POSIX.1-2008.

Ошибки (баги) (Bugs)

Before glibc version 2.24 on certain architectures (e.g., x86,
       but not x86_64) these functions did not set errno.

Смотри также (See also)

fmax(3)