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.Dd May 4, 2005 29.Dt NEXTAFTER 3 30.Os 31.Sh NAME 32.Nm nextafter , 33.Nm nextafterf , 34.Nm nextafterl , 35.Nm nexttoward , 36.Nm nexttowardf , 37.Nm nexttowardl 38.Nd next representable value 39.Sh LIBRARY 40.Lb libm 41.Sh SYNOPSIS 42.In math.h 43.Ft double 44.Fn nextafter "double x" "double y" 45.Ft float 46.Fn nextafterf "float x" "float y" 47.Ft long double 48.Fn nextafterl "long double x" "long double y" 49.Ft double 50.Fn nexttoward "double x" "long double y" 51.Ft float 52.Fn nexttowardf "float x" "long double y" 53.Ft long double 54.Fn nexttowardl "long double x" "long double y" 55.Sh DESCRIPTION 56These functions 57return the next machine representable number from 58.Fa x 59in direction 60.Fa y . 61.Sh SEE ALSO 62.Xr ieee 3 , 63.Xr math 3 64.Sh STANDARDS 65The 66.Fn nextafter , 67.Fn nextafterf , 68.Fn nextafterl , 69.Fn nexttoward , 70.Fn nexttowardf , 71and 72.Fn nexttowardl 73routines conform to 74.St -isoC-99 . 75They implement the Nextafter function recommended by 76.St -ieee754 , 77with the extension that 78.Fn nextafter "+0.0" "-0.0" 79returns 80.Li -0.0 , 81and 82.Fn nextafter "-0.0" "+0.0" 83returns 84.Li +0.0 . 85.Sh HISTORY 86The 87.Fn nextafter 88function appeared in 89.Bx 4.3 , 90and 91.Fn nextafterf 92appeared in 93.Fx 2.0 . 94