1.\" Copyright (c) 1991 The 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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)ceil.3 5.1 (Berkeley) 5/2/91 33.\" $FreeBSD$ 34.\" 35.Dd January 13, 2005 36.Dt CEIL 3 37.Os 38.Sh NAME 39.Nm ceil , 40.Nm ceilf , 41.Nm ceill 42.Nd smallest integral value greater than or equal to x 43.Sh LIBRARY 44.Lb libm 45.Sh SYNOPSIS 46.In math.h 47.Ft double 48.Fn ceil "double x" 49.Ft float 50.Fn ceilf "float x" 51.Ft long double 52.Fn ceill "long double x" 53.Sh DESCRIPTION 54The 55.Fn ceil , 56the 57.Fn ceilf 58and the 59.Fn ceill 60functions return the smallest integral value 61greater than or equal to 62.Fa x , 63expressed as a floating-point number. 64.Sh SEE ALSO 65.Xr abs 3 , 66.Xr fabs 3 , 67.Xr floor 3 , 68.Xr ieee 3 , 69.Xr math 3 , 70.Xr rint 3 , 71.Xr round 3 , 72.Xr trunc 3 73.Sh STANDARDS 74The 75.Fn ceil 76function conforms to 77.St -isoC . 78The 79.Fn ceilf 80and the 81.Fn ceill 82functions conform to 83.St -isoC-99 . 84