cbrtl(3) - BetterMan

cbrtl(3)

cube root function

distropkg manpages-dev@6.9.1-1dataset 2026-04-01T06:19:02Z+debian+ec4110e+mandoc:1.14.6-4

Synopsis

#include <math.h>
double cbrt(double 
x
);
float cbrtf(float 
x
);
long double cbrtl(long double 
x
);
cbrt
():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
        || _XOPEN_SOURCE >= 500
        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
cbrtf
(), 
cbrtl
():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

—

SYNOPSIS

bash

#include <math.h>

bash

double cbrt(double \nx\n);\n
\nfloat cbrtf(float \nx\n);\n
\nlong double cbrtl(long double \nx\n);

cbrt():

bash


\n
    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
\n
        || _XOPEN_SOURCE >= 500
\n
        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
\n
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

cbrtf(), cbrtl():

bash


\n
    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
\n
        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
\n
        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

These functions return the (real) cube root of x. This function cannot fail; every representable real value has a real cube root, and rounding it to a representable value never causes overflow nor underflow.