creal(3) — Linux manual page

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

NAME         top

       creal, crealf, creall - get real part of a complex number

SYNOPSIS         top

       #include <complex.h>

       double creal(double complex z);
       float crealf(float complex z);
       long double creall(long double complex z);

       Link with -lm.

DESCRIPTION         top

       These functions return the real part of the complex number z.

       One has:

           z = creal(z) + I * cimag(z)

VERSIONS         top

       These functions first appeared in glibc in version 2.1.

ATTRIBUTES         top

       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         top

       C99, POSIX.1-2001, POSIX.1-2008.

NOTES         top

       The gcc supports also __real__.  That is a GNU extension.

SEE ALSO         top

       cabs(3), cimag(3), complex(7)

COLOPHON         top

       This page is part of release 5.13 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/.

                               2021-03-22                       CREAL(3)

Pages that refer to this page: cimag(3),  complex(7)

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