cabs(3) Library Functions Manual cabs(3)

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 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)).

abs(3), cimag(3), hypot(3), complex(7)

2023-10-31 Linux man-pages 6.7