Java String to Double atof(String s)

Description

Returns the double value of s.

License

Open Source License

Parameter

Parameter	Description
s	the string containing the floating point number

Return

the value of the floating point number in s

Declaration

public static double atof(String s) 

Method Source Code

//package com.java2s;
/*/*from w  w w.  ja  v  a  2  s  .  c om*/
 * Created on Oct 23, 2003
 *
 * Copyright (c) 2005 Derone Bryson
 *
 * This program is free software; you can redistribute it and/or modify it under 
 * the terms of the GNU General Public License as published by the Free Software 
 * Foundation; either version 2, or (at your option) any later version.
 *
 * This program 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 General Public License for more 
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with 
 * this software; see the file COPYING. If not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * As a special exception, Derone Bryson and the StopMojo Project gives 
 * permission for additional uses of the text contained in its release of 
 * StopMojo.
 *
 * The exception is that, Derone Bryson and the the StopMojo Project hereby 
 * grants permission for non-GPL compatible modules (jar files, libraries, 
 * codecs, etc.) to be used and distributed together with StopMojo. This 
 * permission is above and beyond the permissions granted by the GPL license 
 * StopMojo is covered by.
 *
 * This exception does not however invalidate any other reasons why the 
 * executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by Derone Bryson and/or the
 * StopMojo Project under the name StopMojo. If you copy code from other Free 
 * Software Foundation releases into a copy of StopMojo, as the General Public 
 * License permits, the exception does not apply to the code that you add in 
 * this way. To avoid misleading anyone as to the status of such modified files, 
 * you must delete this exception notice from them.
 *
 * If you write modifications of your own for StopMojo, it is your choice 
 * whether to permit this exception to apply to your modifications. If you do 
 * not wish that, delete this exception notice.  
 */

public class Main {
    /**
     * Returns the double value of s.
     * 
     * @param s
     *            the string containing the floating point number
     * @return the value of the floating point number in s
     */
    public static double atof(String s) {
        int i, numMinuses = 0, numDots = 0;

        s = s.trim();
        for (i = 0; i < s.length()
                && (s.charAt(i) == '-' || s.charAt(i) == '.' || Character.isDigit(s.charAt(i))); i++)
            if (s.charAt(i) == '-')
                numMinuses++;
            else if (s.charAt(i) == '.')
                numDots++;

        if (i != 0 && numMinuses < 2 && numDots < 2)
            return Double.parseDouble(s.substring(0, i));

        return 0.0;
    }
}

Related

1. asDouble(String str)
2. asDouble(String string)
3. asDouble(String value)
4. atof(String pString_)
5. atof(String s)
6. atof(String s)
7. convertStringToDouble(String num)
8. convertStringToDouble(String number)
9. convertStringToDouble(String s)