1.\" Copyright (c) 1985, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91 29.\" $FreeBSD$ 30.\" 31.Dd May 4, 2005 32.Dt NEXTAFTER 3 33.Os 34.Sh NAME 35.Nm nextafter , 36.Nm nextafterf , 37.Nm nextafterl , 38.Nm nexttoward , 39.Nm nexttowardf , 40.Nm nexttowardl 41.Nd next representable value 42.Sh LIBRARY 43.Lb libm 44.Sh SYNOPSIS 45.In math.h 46.Ft double 47.Fn nextafter "double x" "double y" 48.Ft float 49.Fn nextafterf "float x" "float y" 50.Ft long double 51.Fn nextafterl "long double x" "long double y" 52.Ft double 53.Fn nexttoward "double x" "long double y" 54.Ft float 55.Fn nexttowardf "float x" "long double y" 56.Ft long double 57.Fn nexttowardl "long double x" "long double y" 58.Sh DESCRIPTION 59These functions 60return the next machine representable number from 61.Fa x 62in direction 63.Fa y . 64.Sh SEE ALSO 65.Xr ieee 3 , 66.Xr math 3 67.Sh STANDARDS 68The 69.Fn nextafter , 70.Fn nextafterf , 71.Fn nextafterl , 72.Fn nexttoward , 73.Fn nexttowardf , 74and 75.Fn nexttowardl 76routines conform to 77.St -isoC-99 . 78They implement the Nextafter function recommended by 79.St -ieee754 , 80with the extension that 81.Fn nextafter +0.0, -0.0 82returns 83.Li -0.0 , 84and 85.Fn nextafter -0.0, +0.0 86returns 87.Li +0.0 . 88.Sh HISTORY 89The 90.Fn nextafter 91function appeared in 92.Bx 4.3 , 93and 94.Fn nextafterf 95appeared in 96.Fx 2.0 . 97