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cabs

Section: C Library Functions (3)
Updated: 202-0-08
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cabs, cabsf, cabsl - absolute value of a complex number

Math library (libm,~-lm)

#include <complex.h>
double cabs(double complex z);
float cabsf(float complex z);
long double cabsl(long double complex z);

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	M-Safe

C11, POSIX.-2008.

glibc 2.1. C99, POSIX.-2001.

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