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: @(#)rint.3 5.1 (Berkeley) 5/2/91 29.\" $FreeBSD$ 30.\" 31.Dd July 5, 2004 32.Dt RINT 3 33.Os 34.Sh NAME 35.Nm nearbyint , 36.Nm nearbyintf , 37.Nm rint , 38.Nm rintf 39.Nd round to integral value in floating-point format 40.Sh LIBRARY 41.Lb libm 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 double 49.Fn rint "double x" 50.Ft float 51.Fn rintf "float x" 52.Sh DESCRIPTION 53The 54.Fn rint 55and the 56.Fn rintf 57functions return the integral value nearest to 58.Fa x 59according to the prevailing rounding mode. 60These functions raise an inexact exception when the original argument 61is not an exact integer. 62.Pp 63The 64.Fn nearbyint 65and 66.Fn nearbyintf 67functions perform the same operation, except that they do not raise 68an inexact exception. 69.Sh SEE ALSO 70.Xr abs 3 , 71.Xr ceil 3 , 72.Xr fabs 3 , 73.Xr fenv 3 , 74.Xr floor 3 , 75.Xr ieee 3 , 76.Xr lrint 3 , 77.Xr lround 3 , 78.Xr math 3 , 79.Xr round 3 80.Sh STANDARDS 81The 82.Fn nearbyint , 83.Fn nearbyintf , 84.Fn rint , 85and 86.Fn rintf 87functions conform to 88.St -isoC-99 . 89.Sh HISTORY 90A 91.Fn rint 92function appeared in 93.At v6 . 94The 95.Fn nearbyint 96and 97.Fn nearbyintf 98functions appeared in 99.Fx 5.3 . 100