creal(3) - Linux manual page (original) (raw)

creal(3) Library Functions Manual creal(3)

NAME top

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

LIBRARY top

   Math library (_libm_, _-lm_)

SYNOPSIS top

   **#include <complex.h>**

   **double creal(double complex** _z_**);**
   **float crealf(float complex** _z_**);**
   **long double creall(long double complex** _z_**);**

DESCRIPTION top

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

   One has:

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

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **creal**(), **crealf**(), **creall**()          │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

VERSIONS top

   GCC supports also __real__.  That is a GNU extension.

STANDARDS top

   C11, POSIX.1-2008.

HISTORY top

   glibc 2.1.  C99, POSIX.1-2001.

SEE ALSO top

   [cabs(3)](../man3/cabs.3.html), [cimag(3)](../man3/cimag.3.html), [complex(7)](../man7/complex.7.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 creal(3)

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