1*ec79bc0dSDavid Schultz.\" Copyright (c) 2003 Mike Barcroft <mike@FreeBSD.org> 2*ec79bc0dSDavid Schultz.\" All rights reserved. 3*ec79bc0dSDavid Schultz.\" 4*ec79bc0dSDavid Schultz.\" Redistribution and use in source and binary forms, with or without 5*ec79bc0dSDavid Schultz.\" modification, are permitted provided that the following conditions 6*ec79bc0dSDavid Schultz.\" are met: 7*ec79bc0dSDavid Schultz.\" 1. Redistributions of source code must retain the above copyright 8*ec79bc0dSDavid Schultz.\" notice, this list of conditions and the following disclaimer. 9*ec79bc0dSDavid Schultz.\" 2. Redistributions in binary form must reproduce the above copyright 10*ec79bc0dSDavid Schultz.\" notice, this list of conditions and the following disclaimer in the 11*ec79bc0dSDavid Schultz.\" documentation and/or other materials provided with the distribution. 12*ec79bc0dSDavid Schultz.\" 13*ec79bc0dSDavid Schultz.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14*ec79bc0dSDavid Schultz.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15*ec79bc0dSDavid Schultz.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16*ec79bc0dSDavid Schultz.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17*ec79bc0dSDavid Schultz.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18*ec79bc0dSDavid Schultz.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19*ec79bc0dSDavid Schultz.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20*ec79bc0dSDavid Schultz.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21*ec79bc0dSDavid Schultz.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22*ec79bc0dSDavid Schultz.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23*ec79bc0dSDavid Schultz.\" SUCH DAMAGE. 24*ec79bc0dSDavid Schultz.\" 25*ec79bc0dSDavid Schultz.Dd July 18, 2004 26*ec79bc0dSDavid Schultz.Dt SIGNBIT 3 27*ec79bc0dSDavid Schultz.Os 28*ec79bc0dSDavid Schultz.Sh NAME 29*ec79bc0dSDavid Schultz.Nm signbit 30*ec79bc0dSDavid Schultz.Nd "determine whether a floating-point number's sign is negative" 31*ec79bc0dSDavid Schultz.Sh LIBRARY 32*ec79bc0dSDavid Schultz.Lb libm 33*ec79bc0dSDavid Schultz.Sh SYNOPSIS 34*ec79bc0dSDavid Schultz.In math.h 35*ec79bc0dSDavid Schultz.Ft int 36*ec79bc0dSDavid Schultz.Fn signbit "real-floating x" 37*ec79bc0dSDavid Schultz.Sh DESCRIPTION 38*ec79bc0dSDavid SchultzThe 39*ec79bc0dSDavid Schultz.Fn signbit 40*ec79bc0dSDavid Schultzmacro takes an argument of 41*ec79bc0dSDavid Schultz.Fa x 42*ec79bc0dSDavid Schultzand returns non-zero if the value of its sign is negative, otherwise 0. 43*ec79bc0dSDavid Schultz.Sh SEE ALSO 44*ec79bc0dSDavid Schultz.Xr fpclassify 3 , 45*ec79bc0dSDavid Schultz.Xr math 3 46*ec79bc0dSDavid Schultz.Sh STANDARDS 47*ec79bc0dSDavid SchultzThe 48*ec79bc0dSDavid Schultz.Fn signbit 49*ec79bc0dSDavid Schultzmacro conforms to 50*ec79bc0dSDavid Schultz.St -isoC-99 . 51*ec79bc0dSDavid Schultz.Sh HISTORY 52*ec79bc0dSDavid SchultzThe 53*ec79bc0dSDavid Schultz.Fn signbit 54*ec79bc0dSDavid Schultzmacro was added in 55*ec79bc0dSDavid Schultz.Fx 5.1 . 56