1.\" $OpenBSD: sqrt.3,v 1.9 2003/06/02 20:18:41 millert 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 May 6, 1991 32.Dt SQRT 3 33.Os 34.Sh NAME 35.Nm cbrt , 36.Nm cbrtf , 37.Nm sqrt , 38.Nm sqrtf 39.Nd cube root and square root functions 40.Sh SYNOPSIS 41.Fd #include <math.h> 42.Ft double 43.Fn cbrt "double x" 44.Ft float 45.Fn cbrtf "float x" 46.Ft double 47.Fn sqrt "double x" 48.Ft float 49.Fn sqrtf "float x" 50.Sh DESCRIPTION 51The 52.Fn cbrt 53function computes the cube root of 54.Ar x . 55The 56.Fn cbrtf 57function is a single precision version of 58.Fn cbrt . 59.Pp 60The 61.Fn sqrt 62function computes 63the non-negative square root of x. 64The 65.Fn sqrtf 66function is a single precision version of 67.Fn sqrt . 68.Sh RETURN VALUES 69If x is negative, 70.Fn sqrt "x" 71and 72.Fn sqrtf "x" 73set the global variable 74.Va errno 75to EDOM. 76.Sh SEE ALSO 77.Xr math 3 78.Sh HISTORY 79The 80.Fn cbrt 81function appeared in 82.Bx 4.3 . 83