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 5, 2011 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 LIBRARY 43.Lb libm 44.Sh SYNOPSIS 45.In math.h 46.Ft double 47.Fn cbrt "double x" 48.Ft float 49.Fn cbrtf "float x" 50.Ft long double 51.Fn cbrtl "long double x" 52.Ft double 53.Fn sqrt "double x" 54.Ft float 55.Fn sqrtf "float x" 56.Ft long double 57.Fn sqrtl "long double x" 58.Sh DESCRIPTION 59The 60.Fn cbrt , 61.Fn cbrtf , 62and 63.Fn cbrtl 64functions compute 65the cube root of 66.Ar x . 67.Pp 68The 69.Fn sqrt , 70.Fn sqrtf , 71and 72.Fn sqrtl 73functions compute the 74non-negative square root of 75.Ar x . 76.Sh RETURN VALUES 77The 78.Fn cbrt , 79.Fn cbrtf , 80and 81.Fn cbrtl 82functions return the requested cube root. 83The 84.Fn sqrt , 85.Fn sqrtf , 86and 87.Fn sqrtl 88functions return the requested square root 89unless an error occurs. 90An attempt to take the 91.Fn sqrt 92of negative 93.Fa x 94raises an invalid exception and causes an \*(Na to be returned 95(except that the square root of -0 is valid and equal to -0.) 96.Sh SEE ALSO 97.Xr fenv 3 , 98.Xr math 3 99.Sh STANDARDS 100The 101.Fn cbrt , 102.Fn cbrtf , 103.Fn cbrtl , 104.Fn sqrt , 105.Fn sqrtf , 106and 107.Fn sqrtl 108functions conform to 109.St -isoC-99 . 110.Sh HISTORY 111The 112.Fn cbrt 113function appeared in 114.Bx 4.3 . 115The 116.Fn sqrtl 117function appeared in 118.Fx 8.0 . 119The 120.Fn cbrtl 121function appeared in 122.Fx 9.0 . 123