cabs man page

#include <complex.h>

double cabs(double complex z);
float cabsf(float complex z);
long double cabsl(long double complex z);

Link with -lm.

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

These functions first appeared in glibc in version 2.1.

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

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)

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abs(3), cacosh(3), carg(3), casinh(3), catanh(3), ccos(3), ccosh(3), cexp(3), cexp2(3), cimag(3), clog(3), clog10(3), clog2(3), complex(7), conj(3), cpow(3), cproj(3), creal(3), csin(3), csinh(3), csqrt(3), ctan(3), ctanh(3), fabs(3), hypot(3).

cabsf(3) and cabsl(3) are aliases of cabs(3).