классифицировать настоящий плавающий тип (classify real floating type)
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)
fpclassify — classify real floating type
Синопсис (Synopsis)
#include <math.h>
int fpclassify(real-floating x);
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.
The fpclassify() macro shall classify its argument value as NaN,
infinite, normal, subnormal, zero, or into another
implementation-defined category. First, an argument represented
in a format wider than its semantic type is converted to its
semantic type. Then classification is based on the type of the
argument.
Возвращаемое значение (Return value)
The fpclassify() macro shall return the value of the number
classification macro appropriate to the value of its argument.
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)
isfinite(3p), isinf(3p), isnan(3p), isnormal(3p), signbit(3p)
The Base Definitions volume of POSIX.1‐2017, math.h(0p)
