1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" @(#)fabs.3 5.1 (Berkeley) 5/2/91 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: @(#)fabs.3 5.1 (Berkeley) 5/2/91 30.\" $FreeBSD$ 31.\" 32.Dd October 25, 2003 33.Dt FABS 3 34.Os 35.Sh NAME 36.Nm fabs , 37.Nm fabsf , 38.Nm fabsl 39.Nd floating-point absolute value functions 40.Sh LIBRARY 41.Lb libm 42.Sh SYNOPSIS 43.In math.h 44.Ft double 45.Fn fabs "double x" 46.Ft float 47.Fn fabsf "float x" 48.Ft long double 49.Fn fabsl "long double x" 50.Sh DESCRIPTION 51The 52.Fn fabs , 53.Fn fabsf 54and 55.Fn fabsl 56functions compute the absolute value of a floating-point number 57.Fa x . 58.Sh RETURN VALUES 59The 60.Fn fabs , 61.Fn fabsf 62and 63.Fn fabsl 64functions return the absolute value of 65.Fa x . 66.Sh SEE ALSO 67.Xr abs 3 , 68.Xr ceil 3 , 69.Xr floor 3 , 70.Xr ieee 3 , 71.Xr math 3 , 72.Xr rint 3 73.Sh STANDARDS 74The 75.Fn fabs 76function conforms to 77.St -isoC . 78The 79.Fn fabsf 80and 81.Fn fabsl 82functions conform to 83.St -isoC-99 . 84