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. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by the University of 16.\" California, Berkeley and its contributors. 17.\" 4. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" from: @(#)fabs.3 5.1 (Berkeley) 5/2/91 34.\" $FreeBSD$ 35.\" 36.Dd October 25, 2003 37.Dt FABS 3 38.Os 39.Sh NAME 40.Nm fabs , 41.Nm fabsf , 42.Nm fabsl 43.Nd floating-point absolute value functions 44.Sh LIBRARY 45.Lb libm 46.Sh SYNOPSIS 47.In math.h 48.Ft double 49.Fn fabs "double x" 50.Ft float 51.Fn fabsf "float x" 52.Ft long double 53.Fn fabsl "long double x" 54.Sh DESCRIPTION 55The 56.Fn fabs , 57the 58.Fn fabsf 59and the 60.Fn fabsl 61functions compute the absolute value of a floating-point number 62.Fa x . 63.Sh RETURN VALUES 64The 65.Fn fabs , 66the 67.Fn fabsf 68and the 69.Fn fabsl 70functions return the absolute value of 71.Fa x . 72.Sh SEE ALSO 73.Xr abs 3 , 74.Xr ceil 3 , 75.Xr floor 3 , 76.Xr ieee 3 , 77.Xr math 3 , 78.Xr rint 3 79.Sh STANDARDS 80The 81.Fn fabs 82function conforms to 83.St -isoC . 84The 85.Fn fabsf 86and the 87.Fn fabsl 88functions conform to 89.St -isoC-99 . 90