функция манипулирования числами (number manipulation function)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
copysign, copysignf, copysignl — number manipulation function
Синопсис (Synopsis)
#include <math.h>
double copysign(double x, double y);
float copysignf(float x, float y);
long double copysignl(long double x, long double y);
Описание (Description)
The functionality described on this reference page is aligned
with the ISO C standard. Any conflict between the requirements
described here and the ISO C standard is unintentional. This
volume of POSIX.1‐2017 defers to the ISO C standard.
These functions shall produce a value with the magnitude of x and
the sign of y. On implementations that represent a signed zero
but do not treat negative zero consistently in arithmetic
operations, these functions regard the sign of zero as positive.
Возвращаемое значение (Return value)
Upon successful completion, these functions shall return a value
with the magnitude of x and the sign of y.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
signbit(3p)
The Base Definitions volume of POSIX.1‐2017, math.h(0p)
