CBRT(3)

NAME
cbrt, cbrtf, cbrtl - cube root function

SYNOPSIS
#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():
    _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
    or cc -std=c99
cbrtf(), cbrtl():
    _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOUCE >= 200112L;
    or cc -std=c99

DESCRIPTION
The cbrt() function returns the (real) cube root of x. This function cannot fail; every representable real value has a representable real cube root.

RETURN VALUE
These functions return the cube root of x. If x is +0, -0, positive infinity, negative infinity, or NaN, x is returned.

ERRORS
No errors occur.

ATTRIBUTES

  Multithreading (see pthreads(7))
The cbrt(), cbrtf(), and cbrtl() functions are thread-safe.

CONFORMING TO
C99, POSIX.1-2001.

SEE ALSO
pow(3), sqrt(3)

COLOPHON
This page is part of release 3.65 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.