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Linux 2.6 - man page for crealf (linux section 3)

CREAL(3)						     Linux Programmer's Manual							  CREAL(3)

NAME
creal, crealf, creall - get real part of a complex number
SYNOPSIS
#include <complex.h> double creal(double complex z); float crealf(float complex z); long double creall(long double complex z); Link with -lm.
DESCRIPTION
These functions return the real part of the complex number z. One has: z = creal(z) + I * cimag(z)
VERSIONS
These functions first appeared in glibc in version 2.1.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------------------------+---------------+---------+ |Interface | Attribute | Value | +----------------------------+---------------+---------+ |creal(), crealf(), creall() | Thread safety | MT-Safe | +----------------------------+---------------+---------+
CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
NOTES
The gcc supports also __real__. That is a GNU extension.
SEE ALSO
cabs(3), cimag(3), complex(7) 2015-04-19 CREAL(3)

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