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HP-UX 11i Version 3: February 2007

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cbrt(), cbrtf(), cbrtl(), cbrtw(), cbrtq() — cube root functions


#include <math.h>

double cbrt(double x);

float cbrtf(float x);

HP Integrity Server Only

long double cbrtl(long double x);

extended cbrtw(extended x);

quad cbrtq(quad x);


cbrt() computes the cube root of x.

cbrtf() is a float version of cbrt(); it takes a float argument and returns a float result.

Integrity Server Only

cbrtl() is a long double version of cbrt(); it takes a long double argument and returns a long double result.

cbrtw() is an extended version of cbrt(); it takes an extended argument and returns an extended result.

cbrtq() is equivalent to cbrtl() on HP-UX systems.


To use these functions, compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options.

To use (for Integrity servers) cbrtw() or cbrtq(), compile also with the -fpwidetypes option.

To use any of these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line.

For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site: http://www.hp.com/go/fp.


If x is ±INFINITY or ±zero, cbrt() returns x.

If x is NaN, cbrt() returns NaN.

cbrt() raises the inexact exception whenever a rounded result does not equal the mathematical result.


No errors are defined.


cbrt() : SVID3, XPG4.2, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

cbrtf(), cbrtl() : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

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