SQRT

Section: C Library Functions (3)
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BSD mandoc

NAME

cbrt sqrt - cube root and square root functions

SYNOPSIS

Fd #include <math.h> Ft double Fn cbrt double x Ft double Fn sqrt double x

DESCRIPTION

The Fn cbrt function computes the cube root of x

The Fn sqrt computes the non-negative square root of x.

RETURN VALUES

The Fn cbrt function returns the requested cube root. The Fn sqrt function returns the requested square root unless an error occurs. On the VAX or Tahoe processor an attempt to take the Fn sqrt of negative Fa x causes an error; in this event, the global variable errno is set to EDOM and a reserved operand fault is generated.

ERROR (due to Roundoff etc.)

The Fn cbrt function is accurate to within 0.7 ulps

The Fn sqrt function on a VAX is accurate to within 0.501 ulps Sqrt on a machine that conforms to IEEE 754 is correctly rounded in accordance with the rounding mode in force; the error is less than half an ulp in the default mode (round-to-nearest). An ulp is one U nit in the L ast P lace carried.

STANDARDS

The sqrt function conforms to St -ansiC .

HISTORY

The cbrt function appeared in BSD 4.3

This document was created by man2html, using the manual pages.
Time: 00:35:29 GMT, March 30, 2022