CBRT(3) Linux Programmer's Manual CBRT(3)

cbrt, cbrtf, cbrtl - cube root function 

#include <math.h>
double cbrt(double x);
float cbrtf(float x);
long double cbrtl(long double x);

Link with -lm.

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

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

These functions return the (real) cube root of x. This function cannot fail; every representable real value has a representable real cube root.

These functions return the cube root of x.

If x is +0, -0, positive infinity, negative infinity, or NaN, x is returned.

No errors occur.

For an explanation of the terms used in this section, see attributes(7).
Interface Attribute Value
cbrt (), cbrtf (), cbrtl () Thread safety MT-Safe

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

pow(3), sqrt(3)

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2021-03-22 GNU