cbrt(3) Library Functions Manual cbrt(3)
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 re-
turned.
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
C99, POSIX.1-2001.
SEE ALSO
pow(3), sqrt(3)
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