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.

These functions were added in glibc 2.1.

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

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

C99, POSIX.1-2001, POSIX.1-2008.

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)

2022-12-15 Linux man-pages 6.02