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 May 2, 1991 37.Dt FABS 3 38.Os 39.Sh NAME 40.Nm fabs , 41.Nm fabsf 42.Nd floating-point absolute value functions 43.Sh SYNOPSIS 44.Fd #include <math.h> 45.Ft double 46.Fn fabs "double x" 47.Ft float 48.Fn fabsf "float x" 49.Sh DESCRIPTION 50The 51.Fn fabs 52and the 53.Fn fabsf 54functions compute the absolute value of a floating-point number 55.Fa x . 56.Sh RETURN VALUES 57The 58.Fn fabs 59and the 60.Fn fabsf 61functions return the absolute value of 62.Fa x . 63.Sh SEE ALSO 64.Xr abs 3 , 65.Xr ceil 3 , 66.Xr floor 3 , 67.Xr ieee 3 , 68.Xr math 3 , 69.Xr rint 3 70.Sh STANDARDS 71The 72.Fn fabs 73function conforms to 74.St -isoC . 75