.\" Copyright 1995 Jim Van Zandt <jrv@vanzandt.mv.com>
.\"
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.\"
.\" changed `square root' into `cube root' - aeb, 950919
.\"
.\" Modified 2002-07-27 Walter Harms
.\" (walter.harms@informatik.uni-oldenburg.de)
.\"
.TH CBRT 3  2017-09-15 "GNU"  "Linux Programmer's Manual"
.SH NAME
cbrt, cbrtf, cbrtl \- cube root function
.SH SYNOPSIS
.nf
.B #include <math.h>
.PP
.BI "double cbrt(double " x );
.BI "float cbrtf(float " x );
.BI "long double cbrtl(long double " x );
.fi
.PP
Link with \fI\-lm\fP.
.PP
.RS -4
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.RE
.PP
.ad l
.BR cbrt ():
.br
.RS 4
_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
    || _XOPEN_SOURCE\ >=\ 500
.\"    || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.RE
.BR cbrtf (),
.BR cbrtl ():
.RS 4
_ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
    || /* Since glibc 2.19: */ _DEFAULT_SOURCE
    || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
.RE
.ad b
.SH DESCRIPTION
These functions return the (real) cube root of
.IR x .
This function cannot fail; every representable real value has a
representable real cube root.
.SH RETURN VALUE
These functions return the cube root of
.IR x .
.PP
If
.I x
is +0, \-0, positive infinity, negative infinity, or NaN,
.I x
is returned.
.SH ERRORS
No errors occur.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbw24 lb lb
l l l.
Interface	Attribute	Value
T{
.BR cbrt (),
.BR cbrtf (),
.BR cbrtl ()
T}	Thread safety	MT-Safe
.TE
.SH CONFORMING TO
C99, POSIX.1-2001, POSIX.1-2008.
.\" .BR cbrt ()
.\" was a GNU extension. It is now a C99 requirement.
.SH SEE ALSO
.BR pow (3),
.BR sqrt (3)
.SH COLOPHON
This page is part of release 5.10 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.