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():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| _XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
cbrtf(), cbrtl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
Description
These functions return 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
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
|---|---|---|
| cbrt(), cbrtf(), cbrtl() | Thread safety | MT-Safe |
Conforming to
C99, POSIX.1-2001, POSIX.1-2008.
See Also
Colophon
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Referenced By
exp(3), exp10(3), exp2(3), log(3), log10(3), log2(3), pow(3), sqrt(3).
The man pages cbrtf(3) and cbrtl(3) are aliases of cbrt(3).