1.\" Copyright (c) 2005 David Schultz <das@FreeBSD.org> 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.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.Dd April 7, 2005 26.Dt LROUND 3 27.Os 28.Sh NAME 29.Nm llround , 30.Nm llroundf , 31.Nm llroundl , 32.Nm lround , 33.Nm lroundf , 34.Nm lroundl 35.Nd "convert to nearest integral value" 36.Sh LIBRARY 37.Lb libm 38.Sh SYNOPSIS 39.In math.h 40.Ft "long long" 41.Fn llround "double x" 42.Ft "long long" 43.Fn llroundf "float x" 44.Ft "long long" 45.Fn llroundl "long double x" 46.Ft long 47.Fn lround "double x" 48.Ft long 49.Fn lroundf "float x" 50.Ft long 51.Fn lroundl "long double x" 52.Sh DESCRIPTION 53The 54.Fn lround 55function returns the integer nearest to its argument 56.Fa x , 57rounding away from zero in halfway cases. 58If the rounded result is too large to be represented as a 59.Vt long 60value, an invalid exception is raised and the return value is undefined. 61Otherwise, if 62.Fa x 63is not an integer, 64.Fn lround 65may raise an inexact exception. 66When the rounded result is representable as a 67.Vt long , 68the expression 69.Fn lround x 70is equivalent to 71.Po Vt long Pc Ns Fn round x 72(although the former may be more efficient). 73.Pp 74The 75.Fn llround , 76.Fn llroundf , 77.Fn llroundl , 78.Fn lroundf 79and 80.Fn lroundl 81functions differ from 82.Fn lround 83only in their input and output types. 84.Sh SEE ALSO 85.Xr lrint 3 , 86.Xr math 3 , 87.Xr rint 3 , 88.Xr round 3 89.Sh STANDARDS 90The 91.Fn llround , 92.Fn llroundf , 93.Fn llroundl , 94.Fn lround , 95.Fn lroundf , 96and 97.Fn lroundl 98functions conform to 99.St -isoC-99 . 100.Sh HISTORY 101The 102.Vt float 103and 104.Vt double 105versions of these routines first appeared in 106.Fx 5.4 . 107The 108.Vt "long double" 109versions appeared in 110.Fx 6.0 . 111