cabs

(3)

absolute value of a complex number

Library functionsmanpages-dev 6.9.1-1also documents cabsf, cabsl

#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)

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

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

Interface	Attribute	Value
cabs (), cabsf (), cabsl ()	Thread safety	MT-Safe

C11, POSIX.1-2008.

glibc 2.1. C99, POSIX.1-2001.

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