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 March 1, 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 LIBRARY 42.Lb libm 43.Sh SYNOPSIS 44.In math.h 45.Ft double 46.Fn cbrt "double x" 47.Ft float 48.Fn cbrtf "float x" 49.Ft double 50.Fn sqrt "double x" 51.Ft float 52.Fn sqrtf "float x" 53.Ft long double 54.Fn sqrtl "long double x" 55.Sh DESCRIPTION 56The 57.Fn cbrt 58and the 59.Fn cbrtf 60functions compute 61the cube root of 62.Ar x . 63.Pp 64The 65.Fn sqrt , 66.Fn sqrtf , 67and 68.Fn sqrtl 69functions compute the 70non-negative square root of x. 71.Sh RETURN VALUES 72The 73.Fn cbrt 74and the 75.Fn cbrtf 76functions return the requested cube root. 77The 78.Fn sqrt , 79.Fn sqrtf , 80and 81.Fn sqrtl 82functions return the requested square root 83unless an error occurs. 84An attempt to take the 85.Fn sqrt 86of negative 87.Fa x 88raises an invalid exception and causes an \*(Na to be returned 89(except that the square root of -0 is valid and equal to -0.) 90.Sh SEE ALSO 91.Xr fenv 3 , 92.Xr math 3 93.Sh STANDARDS 94The 95.Fn cbrt , 96.Fn cbrtf , 97.Fn sqrt , 98.Fn sqrtf , 99and 100.Fn sqrtl 101functions conform to 102.St -isoC-99 . 103.Sh HISTORY 104The 105.Fn cbrt 106function appeared in 107.Bx 4.3 . 108The 109.Fn sqrtl 110function appeared in 111.Fx 8.0 . 112