Ubuntu Manpages

cbrt, cbrtf, cbrtl

cube root function

#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():

_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
cbrtf(), cbrtl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOUCE >= 200112L;
or cc -std=c99

The cbrt() function returns the (real) cube root of x. This function cannot fail; every representable real value has a representable real cube root.

These functions return the cube root of x.

If x is +0, -0, positive infinity, negative infinity, or NaN, x is returned.

No errors occur.

C99, POSIX.1-2001.

pow(3), sqrt(3)

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