функция остатка (remainder 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)
remainder, remainderf, remainderl — remainder function
Синопсис (Synopsis)
#include <math.h>
double remainder(double x, double y);
float remainderf(float x, float y);
long double remainderl(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 return the floating-point remainder r=x-ny
when y is non-zero. The value n is the integral value nearest the
exact value x/y. When |n-x/y|=½, the value n is chosen to be
even.
The behavior of remainder() shall be independent of the rounding
mode.
Возвращаемое значение (Return value)
Upon successful completion, these functions shall return the
floating-point remainder r=x-ny when y is non-zero.
On systems that do not support the IEC 60559 Floating-Point
option, if y is zero, it is implementation-defined whether a
domain error occurs or zero is returned.
If x or y is NaN, a NaN shall be returned.
If x is infinite or y is 0 and the other is non-NaN, a domain
error shall occur, and a NaN shall be returned.
Ошибки (Error)
These functions shall fail if:
Domain Error
The x argument is ±Inf, or the y argument is ±0 and
the other argument is non-NaN.
If the integer expression (math_errhandling &
MATH_ERRNO) is non-zero, then errno shall be set to
[EDOM]. If the integer expression (math_errhandling
& MATH_ERREXCEPT) is non-zero, then the invalid
floating-point exception shall be raised.
These functions may fail if:
Domain Error
The y argument is zero.
If the integer expression (math_errhandling &
MATH_ERRNO) is non-zero, then errno shall be set to
[EDOM]. If the integer expression (math_errhandling
& MATH_ERREXCEPT) is non-zero, then the invalid
floating-point exception shall be raised.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
On error, the expressions (math_errhandling & MATH_ERRNO) and
(math_errhandling & MATH_ERREXCEPT) are independent of each
other, but at least one of them must be non-zero.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
abs(3p), div(3p), feclearexcept(3p), fetestexcept(3p), ldiv(3p)
The Base Definitions volume of POSIX.1‐2017, Section 4.20,
Treatment of Error Conditions for Mathematical Functions,
math.h(0p)
