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.\" $FreeBSD$ 30.\" 31.Dd January 13, 2008 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 LIBRARY 43.Lb libm 44.Sh SYNOPSIS 45.In math.h 46.Ft double 47.Fn nearbyint "double x" 48.Ft float 49.Fn nearbyintf "float x" 50.Ft long double 51.Fn nearbyintl "long double x" 52.Ft double 53.Fn rint "double x" 54.Ft float 55.Fn rintf "float x" 56.Ft long double 57.Fn rintl "long double x" 58.Sh DESCRIPTION 59The 60.Fn rint , 61.Fn rintf , 62and 63.Fn rintl 64functions return the integral value nearest to 65.Fa x 66according to the prevailing rounding mode. 67These functions raise an inexact exception when the original argument 68is not an exact integer. 69.Pp 70The 71.Fn nearbyint , 72.Fn nearbyintf , 73and 74.Fn nearbyintl 75functions perform the same operation, except that they do not raise 76an inexact exception. 77.Sh SEE ALSO 78.Xr abs 3 , 79.Xr ceil 3 , 80.Xr fabs 3 , 81.Xr fenv 3 , 82.Xr floor 3 , 83.Xr ieee 3 , 84.Xr lrint 3 , 85.Xr lround 3 , 86.Xr math 3 , 87.Xr round 3 88.Sh STANDARDS 89These functions conform to 90.St -isoC-99 . 91.Sh HISTORY 92A 93.Fn rint 94function appeared in 95.At v6 . 96The 97.Fn nearbyint 98and 99.Fn nearbyintf 100functions appeared in 101.Fx 5.3 , 102and the long double variants were first available in 103.Fx 8.0 . 104