creal(3)

creal3

Get real part of a complex number

Usage

#include <complex.h>

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

Library

Math library (libm, -lm)

Overview

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

One has:

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

Attributes

For an explanation of the terms used in this section, see attributes(7).

InterfaceAttributeValue
creal(), crealf(), creall()Thread safetyMT-Safe

Versions

GCC supports also __real__. That is a GNU extension.

Releases

12 releases since Debian 3.1 (Sarge); the text changed 11 times.

  1. 3.1
  2. 4.0
  3. 5.0
  4. 6.0
  5. 7
  6. 8
  7. 9
  8. 10
  9. 11
  10. 12
  11. 13
  12. Arch

Standards

C11, POSIX.1-2008.

History

glibc 2.1. C99, POSIX.1-2001.

From man-pages 6.19-1 in Arch Linux 2026-11-01. Parsed by carta from the page's man source.