| .\" Copyright 1995 Jim Van Zandt <jrv@vanzandt.mv.com> |
| .\" |
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| .\" Since the Linux kernel and libraries are constantly changing, this |
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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 2016-03-15 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| cbrt, cbrtf, cbrtl \- cube root function |
| .SH SYNOPSIS |
| .nf |
| .B #include <math.h> |
| .sp |
| .BI "double cbrt(double " x ); |
| .br |
| .BI "float cbrtf(float " x ); |
| .br |
| .BI "long double cbrtl(long double " x ); |
| .fi |
| .sp |
| Link with \fI\-lm\fP. |
| .sp |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .sp |
| .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 . |
| |
| 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) |