1.\" Copyright (c) 1985, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)sqrt.3 6.4 (Berkeley) 5/6/91 29.\" $FreeBSD$ 30.\" 31.Dd December 14, 2007 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 LIBRARY 41.Lb libm 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 double 49.Fn sqrt "double x" 50.Ft float 51.Fn sqrtf "float x" 52.Sh DESCRIPTION 53The 54.Fn cbrt 55and the 56.Fn cbrtf 57functions compute 58the cube root of 59.Ar x . 60.Pp 61The 62.Fn sqrt 63and the 64.Fn sqrtf 65functions compute the 66non-negative square root of x. 67.Sh RETURN VALUES 68The 69.Fn cbrt 70and the 71.Fn cbrtf 72functions return the requested cube root. 73The 74.Fn sqrt 75and the 76.Fn sqrtf 77functions return the requested square root 78unless an error occurs. 79An attempt to take the 80.Fn sqrt 81of negative 82.Fa x 83raises an invalid exception and causes an \*(Na to be returned 84(except that the square root of -0 is valid and equal to -0.) 85.Sh SEE ALSO 86.Xr fenv 3 , 87.Xr math 3 88.Sh STANDARDS 89The 90.Fn cbrt , 91.Fn cbrtf , 92.Fn sqrt , 93and 94.Fn sqrtf 95functions conform to 96.St -isoC-99 . 97.Sh HISTORY 98The 99.Fn cbrt 100function appeared in 101.Bx 4.3 . 102