1.\" Copyright (c) 2004, 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 16, 2005 26.Dt TRUNC 3 27.Os 28.Sh NAME 29.Nm trunc , 30.Nm truncf , 31.Nm truncl 32.Nd nearest integral value with magnitude less than or equal to |x| 33.Sh LIBRARY 34.Lb libm 35.Sh SYNOPSIS 36.In math.h 37.Ft double 38.Fn trunc "double x" 39.Ft float 40.Fn truncf "float x" 41.Ft "long double" 42.Fn truncl "long double x" 43.Sh DESCRIPTION 44The 45.Fn trunc , 46.Fn truncf , 47and 48.Fn truncl 49functions return the nearest integral value with magnitude less than 50or equal to 51.Pf | Fa x Ns | . 52They are equivalent to 53.Fn rint , 54.Fn rintf , 55and 56.Fn rintl , 57respectively, in the 58.Dv FE_TOWARDZERO 59rounding mode. 60.Sh SEE ALSO 61.Xr ceil 3 , 62.Xr fesetround 3 , 63.Xr floor 3 , 64.Xr math 3 , 65.Xr nextafter 3 , 66.Xr rint 3 , 67.Xr round 3 68.Sh STANDARDS 69The 70.Fn trunc , 71.Fn truncf , 72and 73.Fn truncl 74functions conform to 75.St -isoC-99 . 76.Sh HISTORY 77These routines first appeared in 78.Fx 5.3 . 79