creal

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 at-
       tributes(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)

COLOPHON
       This page is part of release 5.05 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

                                  2015-04-19                          CREAL(3)