1.\" $OpenBSD: rint.3,v 1.14 2013/06/05 03:40:26 tedu Exp $ 2.\" Copyright (c) 1985, 1991 Regents of the University of California. 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. Neither the name of the University nor the names of its contributors 14.\" may be used to endorse or promote products derived from this software 15.\" without specific prior written permission. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" from: @(#)rint.3 5.1 (Berkeley) 5/2/91 30.\" 31.Dd $Mdocdate: June 5 2013 $ 32.Dt RINT 3 33.Os 34.Sh NAME 35.Nm nearbyint , 36.Nm nearbyintf , 37.Nm nearbyintl , 38.Nm rint , 39.Nm rintf , 40.Nm rintl 41.Nd round to integral value in floating-point format 42.Sh SYNOPSIS 43.In math.h 44.Ft double 45.Fn nearbyint "double x" 46.Ft float 47.Fn nearbyintf "float x" 48.Ft long double 49.Fn nearbyintl "long double x" 50.Ft double 51.Fn rint "double x" 52.Ft float 53.Fn rintf "float x" 54.Ft long double 55.Fn rintl "long double x" 56.Sh DESCRIPTION 57The 58.Fn rint , 59.Fn rintf , 60and 61.Fn rintl 62functions return the integral value nearest to 63.Fa x 64according to the prevailing rounding mode. 65.Pp 66The 67.Fn nearbyint , 68.Fn nearbyintf , 69and 70.Fn nearbyintl 71functions do the same, 72but without raising the 73.Dq inexact 74floating-point exception. 75.Sh SEE ALSO 76.Xr abs 3 , 77.Xr ceil 3 , 78.Xr fabs 3 , 79.Xr floor 3 80.Sh HISTORY 81A 82.Fn rint 83function appeared in 84.At v6 . 85