cbrt(), cbrtf(), cbrtl()

Synopsis:

#include <math.h>

double cbrt ( double x );

float cbrtf ( float x );

long double cbrtl ( long double x );

Arguments:

x: The number whose cube root you want to calculate.

Library:

libm

Use the -l m option to qcc to link against this 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.

If `x` is:	These functions return:	Errors:
±0.0	`x`	—
±Inf	`x`	—
NaN	NaN	—

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:

ANSI, POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	No
Thread	Yes