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. 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.\" 30.Dd May 4, 2005 31.Dt NEXTAFTER 3 32.Os 33.Sh NAME 34.Nm nextafter , 35.Nm nextafterf , 36.Nm nextafterl , 37.Nm nexttoward , 38.Nm nexttowardf , 39.Nm nexttowardl 40.Nd next representable value 41.Sh LIBRARY 42.Lb libm 43.Sh SYNOPSIS 44.In math.h 45.Ft double 46.Fn nextafter "double x" "double y" 47.Ft float 48.Fn nextafterf "float x" "float y" 49.Ft long double 50.Fn nextafterl "long double x" "long double y" 51.Ft double 52.Fn nexttoward "double x" "long double y" 53.Ft float 54.Fn nexttowardf "float x" "long double y" 55.Ft long double 56.Fn nexttowardl "long double x" "long double y" 57.Sh DESCRIPTION 58These functions 59return the next machine representable number from 60.Fa x 61in direction 62.Fa y . 63.Sh SEE ALSO 64.Xr ieee 3 , 65.Xr math 3 66.Sh STANDARDS 67The 68.Fn nextafter , 69.Fn nextafterf , 70.Fn nextafterl , 71.Fn nexttoward , 72.Fn nexttowardf , 73and 74.Fn nexttowardl 75routines conform to 76.St -isoC-99 . 77They implement the Nextafter function recommended by 78.St -ieee754 , 79with the extension that 80.Fn nextafter "+0.0" "-0.0" 81returns 82.Li -0.0 , 83and 84.Fn nextafter "-0.0" "+0.0" 85returns 86.Li +0.0 . 87.Sh HISTORY 88The 89.Fn nextafter 90function appeared in 91.Bx 4.3 , 92and 93.Fn nextafterf 94appeared in 95.Fx 2.0 . 96