1.\" $OpenBSD: fabs.3,v 1.3 2013/07/18 10:14:48 schwarze Exp $ 2.\" Copyright (c) 1991 The Regents of the University of California. 3.\" All rights reserved. 4.\" 5.\" @(#)fabs.3 5.1 (Berkeley) 5/2/91 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" from: @(#)fabs.3 5.1 (Berkeley) 5/2/91 31.\" 32.Dd $Mdocdate: July 18 2013 $ 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 SYNOPSIS 41.In math.h 42.Ft double 43.Fn fabs "double x" 44.Ft float 45.Fn fabsf "float x" 46.Ft long double 47.Fn fabsl "long double x" 48.Sh DESCRIPTION 49The 50.Fn fabs 51function computes the absolute value of a floating-point number 52.Fa x . 53The 54.Fn fabsf 55function is a single precision version of 56.Fn fabs . 57The 58.Fn fabsl 59function is an extended precision version of 60.Fn fabs . 61.Sh RETURN VALUES 62The 63.Fn fabs , 64.Fn fabsf 65and 66.Fn fabsl 67functions return the absolute value of 68.Fa x . 69.Sh SEE ALSO 70.Xr abs 3 , 71.Xr ceil 3 , 72.Xr floor 3 , 73.Xr rint 3 74.Sh STANDARDS 75The 76.Fn fabs 77function conforms to 78.St -ansiC . 79.Sh HISTORY 80An 81.Fn fabs 82function first appeared in 83.At v6 . 84