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.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91 33.\" $FreeBSD: src/lib/msun/man/nextafter.3,v 1.2 2005/03/07 05:00:29 das Exp $ 34.\" 35.Dd May 4, 2005 36.Dt NEXTAFTER 3 37.Os 38.Sh NAME 39.Nm nextafter , 40.Nm nextafterf , 41.Nm nextafterl , 42.Nm nexttoward , 43.Nm nexttowardf , 44.Nm nexttowardl 45.Nd next representable value 46.Sh LIBRARY 47.Lb libm 48.Sh SYNOPSIS 49.In math.h 50.Ft double 51.Fn nextafter "double x" "double y" 52.Ft float 53.Fn nextafterf "float x" "float y" 54.Ft long double 55.Fn nextafterl "long double x" "long double y" 56.Ft double 57.Fn nexttoward "double x" "long double y" 58.Ft float 59.Fn nexttowardf "float x" "long double y" 60.Ft long double 61.Fn nexttowardl "long double x" "long double y" 62.Sh DESCRIPTION 63These functions 64return the next machine representable number from 65.Fa x 66in direction 67.Fa y . 68.Sh SEE ALSO 69.Xr ieee 3 , 70.Xr math 3 71.Sh STANDARDS 72The 73.Fn nextafter , 74.Fn nextafterf , 75.Fn nextafterl , 76.Fn nexttoward , 77.Fn nexttowardf , 78and 79.Fn nexttowardl 80routines conform to 81.St -isoC-99 . 82They implement the Nextafter function recommended by 83.St -ieee754 , 84with the extension that 85.Fn nextafter +0.0, -0.0 86returns 87.Li -0.0 , 88and 89.Fn nextafter -0.0, +0.0 90returns 91.Li +0.0 . 92.Sh HISTORY 93The 94.Fn nextafter 95function appeared in 96.Bx 4.3 , 97and 98.Fn nextafterf 99appeared in 100.Fx 2.0 . 101