creal (3) Linux Manual Page

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)

Colophon

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