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);

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).

STANDARDS¶

C11, POSIX.1-2008.

HISTORY¶

C99, POSIX.1-2001.

SEE ALSO¶

pow(3), sqrt(3)