cabs(3)

cabs3

Absolute value of a complex number

Usage

#include <complex.h>

double cabs(double complex z); float cabsf(float complex z); long double cabsl(long double complex z);

Library

Math library (libm, -lm)

Overview

These functions return the absolute value of the complex number z. The result is a real number.

Attributes

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

InterfaceAttributeValue
cabs(), cabsf(), cabsl()Thread safetyMT-Safe

Notes

The function is actually an alias for hypot(a, b) (or, equivalently, sqrt(a*a + b*b)).

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.