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(linux section 3)
man page for cabs

CABS(3) 						     Linux Programmer's Manual							   CABS(3)

cabs, cabsf, cabsl - absolute value of a complex number SYNOPSIS
#include <complex.h> double cabs(double complex z); float cabsf(float complex z); long double cabsl(long double complex z); Link with -lm. DESCRIPTION
These functions return the absolute value of the complex number z. The result is a real number. 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 | +-------------------------+---------------+---------+ |cabs(), cabsf(), cabsl() | Thread safety | MT-Safe | +-------------------------+---------------+---------+ CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008. NOTES
The function is actually an alias for hypot(a, b) (or, equivalently, sqrt(a*a + b*b)). SEE ALSO
abs(3), cimag(3), hypot(3), complex(7) 2015-04-19 CABS(3)

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