сложные действительные функции (complex real functions)
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)
creal, crealf, creall — complex real functions
Синопсис (Synopsis)
#include <complex.h>
double creal(double complex z);
float crealf(float complex z);
long double creall(long double complex z);
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 compute the real part of z.
Возвращаемое значение (Return value)
These functions shall return the real part value.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
For a variable z of type complex:
z == creal(z) + cimag(z)*I
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
carg(3p), cimag(3p), conj(3p), cproj(3p)
The Base Definitions volume of POSIX.1‐2017, complex.h(0p)
