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: @(#)rint.3 5.1 (Berkeley) 5/2/91 29.\" 30.Dd January 13, 2008 31.Dt RINT 3 32.Os 33.Sh NAME 34.Nm nearbyint , 35.Nm nearbyintf , 36.Nm nearbyintl , 37.Nm rint , 38.Nm rintf , 39.Nm rintl 40.Nd round to integral value in floating-point format 41.Sh LIBRARY 42.Lb libm 43.Sh SYNOPSIS 44.In math.h 45.Ft double 46.Fn nearbyint "double x" 47.Ft float 48.Fn nearbyintf "float x" 49.Ft long double 50.Fn nearbyintl "long double x" 51.Ft double 52.Fn rint "double x" 53.Ft float 54.Fn rintf "float x" 55.Ft long double 56.Fn rintl "long double x" 57.Sh DESCRIPTION 58The 59.Fn rint , 60.Fn rintf , 61and 62.Fn rintl 63functions return the integral value nearest to 64.Fa x 65according to the prevailing rounding mode. 66These functions raise an inexact exception when the original argument 67is not an exact integer. 68.Pp 69The 70.Fn nearbyint , 71.Fn nearbyintf , 72and 73.Fn nearbyintl 74functions perform the same operation, except that they do not raise 75an inexact exception. 76.Sh SEE ALSO 77.Xr abs 3 , 78.Xr ceil 3 , 79.Xr fabs 3 , 80.Xr fenv 3 , 81.Xr floor 3 , 82.Xr ieee 3 , 83.Xr lrint 3 , 84.Xr lround 3 , 85.Xr math 3 , 86.Xr round 3 87.Sh STANDARDS 88These functions conform to 89.St -isoC-99 . 90.Sh HISTORY 91A 92.Fn rint 93function appeared in 94.At v6 . 95The 96.Fn nearbyint 97and 98.Fn nearbyintf 99functions appeared in 100.Fx 5.3 , 101and the long double variants were first available in 102.Fx 8.0 . 103