1.\" $OpenBSD: sqrt.3,v 1.11 2008/12/12 00:10:26 martynas 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: December 12 2008 $ 32.Dt SQRT 3 33.Os 34.Sh NAME 35.Nm cbrt , 36.Nm cbrtf , 37.Nm sqrt , 38.Nm sqrtf , 39.Nm sqrtl 40.Nd cube root and square root functions 41.Sh SYNOPSIS 42.Fd #include <math.h> 43.Ft double 44.Fn cbrt "double x" 45.Ft float 46.Fn cbrtf "float x" 47.Ft double 48.Fn sqrt "double x" 49.Ft float 50.Fn sqrtf "float x" 51.Ft long double 52.Fn sqrtl "long double x" 53.Sh DESCRIPTION 54The 55.Fn cbrt 56function computes the cube root of 57.Ar x . 58The 59.Fn cbrtf 60function is a single precision version of 61.Fn cbrt . 62.Pp 63The 64.Fn sqrt 65function computes 66the non-negative square root of x. 67The 68.Fn sqrtf 69function is a single precision version of 70.Fn sqrt . 71The 72.Fn sqrtl 73function is an extended precision version of 74.Fn sqrt . 75.Sh RETURN VALUES 76If x is negative, 77.Fn sqrt "x" , 78.Fn sqrtf "x" 79and 80.Fn sqrtl "x" 81set the global variable 82.Va errno 83to EDOM. 84.Sh SEE ALSO 85.Xr math 3 86.Sh HISTORY 87The 88.Fn cbrt 89function appeared in 90.Bx 4.3 . 91