1.\" $OpenBSD: sqrt.3,v 1.16 2013/07/17 05:42:11 schwarze Exp $ 2.\" Copyright (c) 1985, 1991 Regents of the University of California. 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. Neither the name of the University nor the names of its contributors 14.\" may be used to endorse or promote products derived from this software 15.\" without specific prior written permission. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" from: @(#)sqrt.3 6.4 (Berkeley) 5/6/91 30.\" 31.Dd $Mdocdate: July 17 2013 $ 32.Dt SQRT 3 33.Os 34.Sh NAME 35.Nm cbrt , 36.Nm cbrtf , 37.Nm cbrtl , 38.Nm sqrt , 39.Nm sqrtf , 40.Nm sqrtl 41.Nd cube root and square root functions 42.Sh SYNOPSIS 43.In math.h 44.Ft double 45.Fn cbrt "double x" 46.Ft float 47.Fn cbrtf "float x" 48.Ft long double 49.Fn cbrtl "long double x" 50.Ft double 51.Fn sqrt "double x" 52.Ft float 53.Fn sqrtf "float x" 54.Ft long double 55.Fn sqrtl "long double x" 56.Sh DESCRIPTION 57The 58.Fn cbrt 59function computes the cube root of 60.Ar x . 61The 62.Fn cbrtf 63function is a single precision version of 64.Fn cbrt . 65The 66.Fn cbrtl 67function is an extended precision version of 68.Fn cbrt . 69.Pp 70The 71.Fn sqrt 72function computes 73the non-negative square root of x. 74The 75.Fn sqrtf 76function is a single precision version of 77.Fn sqrt . 78The 79.Fn sqrtl 80function is an extended precision version of 81.Fn sqrt . 82.Sh RETURN VALUES 83If x is negative, 84.Fn sqrt "x" , 85.Fn sqrtf "x" 86and 87.Fn sqrtl "x" 88set the global variable 89.Va errno 90to EDOM. 91.Sh HISTORY 92A 93.Fn sqrt 94function first appeared in 95.At v3 . 96.Pp 97The 98.Fn cbrt 99function appeared in 100.Bx 4.3 . 101