cbrt(), cbrtf(), cbrtl()

Arguments:

x

The number whose cube root you want to calculate.

Library:

libm

The general-purpose math library.

libm-sve

A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

• If you want only selected processes to run with the SVE version, you can include both libraries in your OS image and use the -l m or -l m-sve option to qcc to link explicitly against the appropriate one.
• If you want all processes to use the SVE version, include libm-sve.so in your OS image and set up a symbolic link from libm.so to libm-sve.so. Use the -l m option to qcc to link against the library.

Description:

The cbrt(), cbrtf(), and cbrtl() functions compute the cube root of x.

To check for error situations, use feclearexcept() and fetestexcept(). For example:

• Call feclearexcept(FE_ALL_EXCEPT) before calling cbrt(), cbrtf(), or cbrtl().
• On return, if fetestexcept(FE_ALL_EXCEPT) is nonzero, then an error has occurred.

Returns:

The cube root of x.

These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.

Examples:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(int argc, char** argv) {
        double a, b;

        a = 27.0;
        b = cbrt(a);
        printf("The cube root of %f is %f \n", a, b);

        return(EXIT_SUCCESS);
}

produces the output:

The cube root of 27.000000 is 3.000000

Classification:

C11, POSIX 1003.1