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cbrt
Section: C Library Functions (3) Updated: 2026-02-08 Index
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NAME
cbrt, cbrtf, cbrtl - cube root function
LIBRARY
Math library
( libm,~ -lm)
SYNOPSIS
#include <math.h>
double cbrt(double x);
float cbrtf(float x);
long double cbrtl(long double x);
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
DESCRIPTION
These functions return the (real) cube root of
x.
This function cannot fail;
every representable real value
has a real cube root,
and rounding it to a representable value
never causes overflow nor underflow.
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
|
STANDARDS
C11, POSIX.1-2008.
HISTORY
GNU, C99, POSIX.1-2001.
SEE ALSO
pow(3),
sqrt(3)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- SEE ALSO
-
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