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.\" $FreeBSD$ 26.\" 27.Dd April 7, 2005 28.Dt LROUND 3 29.Os 30.Sh NAME 31.Nm llround , 32.Nm llroundf , 33.Nm llroundl , 34.Nm lround , 35.Nm lroundf , 36.Nm lroundl 37.Nd "convert to nearest integral value" 38.Sh LIBRARY 39.Lb libm 40.Sh SYNOPSIS 41.In math.h 42.Ft "long long" 43.Fn llround "double x" 44.Ft "long long" 45.Fn llroundf "float x" 46.Ft "long long" 47.Fn llroundl "long double x" 48.Ft long 49.Fn lround "double x" 50.Ft long 51.Fn lroundf "float x" 52.Ft long 53.Fn lroundl "long double x" 54.Sh DESCRIPTION 55The 56.Fn lround 57function returns the integer nearest to its argument 58.Fa x , 59rounding away from zero in halfway cases. 60If the rounded result is too large to be represented as a 61.Vt long 62value, an invalid exception is raised and the return value is undefined. 63Otherwise, if 64.Fa x 65is not an integer, 66.Fn lround 67may raise an inexact exception. 68When the rounded result is representable as a 69.Vt long , 70the expression 71.Fn lround x 72is equivalent to 73.Po Vt long Pc Ns Fn round x 74(although the former may be more efficient). 75.Pp 76The 77.Fn llround , 78.Fn llroundf , 79.Fn llroundl , 80.Fn lroundf 81and 82.Fn lroundl 83functions differ from 84.Fn lround 85only in their input and output types. 86.Sh SEE ALSO 87.Xr lrint 3 , 88.Xr math 3 , 89.Xr rint 3 , 90.Xr round 3 91.Sh STANDARDS 92The 93.Fn llround , 94.Fn llroundf , 95.Fn llroundl , 96.Fn lround , 97.Fn lroundf , 98and 99.Fn lroundl 100functions conform to 101.St -isoC-99 . 102.Sh HISTORY 103The 104.Vt float 105and 106.Vt double 107versions of these routines first appeared in 108.Fx 5.4 . 109The 110.Vt "long double" 111versions appeared in 112.Fx 6.0 . 113