1.\" Copyright (c) 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 3. Neither the name of the University nor the names of its contributors 12.\" may be used to endorse or promote products derived from this software 13.\" without specific prior written permission. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.Dd October 25, 2003 28.Dt FABS 3 29.Os 30.Sh NAME 31.Nm fabs , 32.Nm fabsf , 33.Nm fabsl 34.Nd floating-point absolute value functions 35.Sh LIBRARY 36.Lb libm 37.Sh SYNOPSIS 38.In math.h 39.Ft double 40.Fn fabs "double x" 41.Ft float 42.Fn fabsf "float x" 43.Ft long double 44.Fn fabsl "long double x" 45.Sh DESCRIPTION 46The 47.Fn fabs , 48.Fn fabsf 49and 50.Fn fabsl 51functions compute the absolute value of a floating-point number 52.Fa x . 53.Sh RETURN VALUES 54The 55.Fn fabs , 56.Fn fabsf 57and 58.Fn fabsl 59functions return the absolute value of 60.Fa x . 61.Sh SEE ALSO 62.Xr abs 3 , 63.Xr ceil 3 , 64.Xr floor 3 , 65.Xr ieee 3 , 66.Xr math 3 , 67.Xr rint 3 68.Sh STANDARDS 69The 70.Fn fabs 71function conforms to 72.St -isoC . 73The 74.Fn fabsf 75and 76.Fn fabsl 77functions conform to 78.St -isoC-99 . 79