Java tutorial
//package com.java2s; /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is Parallel Colt. * * The Initial Developer of the Original Code is * Piotr Wendykier, Emory University. * Portions created by the Initial Developer are Copyright (C) 2007 * the Initial Developer. All Rights Reserved. * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ public class Main { public static int extendDimension(int x) { if (x < 1) throw new IllegalArgumentException("x must be greater or equal 1"); int nextExp = nextExp2(x); int nextPow = nextExp + 1; int extDim = (int) Math.round(Math.pow(2.0, (double) nextPow)); return extDim; } public static int nextExp2(int n) { double e = Math.log((double) n) / Math.log(2.0); int p = (int) Math.ceil(e); double f = n / Math.pow(2.0, (double) p); if (f == 0.5) { p = p - 1; } return p; } }