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