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