Here you can find the source of fromBase(String num, String baseChars)
| Parameter | Description |
|---|---|
| num | Encoded String representation of number |
| baseChars | Alphabet of characters used to decode. Size of string implies base, ie "01" would be binary (base 2) |
public static long fromBase(String num, String baseChars)
//package com.java2s; /*/*from w w w .j a v a2 s . c o m*/ * ==================================================================== * JAFFA - Java Application Framework For All * * Copyright (C) 2002 JAFFA Development Group * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Redistribution and use of this software and associated documentation ("Software"), * with or without modification, are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain copyright statements and notices. * Redistributions must also contain a copy of this document. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. The name "JAFFA" must not be used to endorse or promote products derived from * this Software without prior written permission. For written permission, * please contact mail to: jaffagroup@yahoo.com. * 4. Products derived from this Software may not be called "JAFFA" nor may "JAFFA" * appear in their names without prior written permission. * 5. Due credit should be given to the JAFFA Project (http://jaffa.sourceforge.net). * * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== */ public class Main { /** * Decode number from any base. * @param num Encoded String representation of number * @param baseChars Alphabet of characters used to decode. Size of string implies base, * ie "01" would be binary (base 2) * @return Decoded based 10 number */ public static long fromBase(String num, String baseChars) { int base = baseChars.length(); long x = 0; if (num != null) for (int i = 0; i < num.length(); i++) { char c = num.charAt(i); int p = baseChars.indexOf(c); if (p < 0) throw new RuntimeException("fromBase() Invalid character '" + c + "' at position " + i); //System.out.println("["+c+"] x=("+x+"*"+base+")+"+p); x = (x * base) + p; } //System.out.println(num+"[Base "+base+"] = " + x); return x; } }