Java Franction Convert fractionDigits(double number)

Description

Returns the number of digits needed for displaying the postfix values of a number, but at most 7.

License

Open Source License

Parameter

Parameter	Description
number	a parameter

Return

the number of digits needed for displaying the postfix values of a number, but at most 7

Declaration

public static int fractionDigits(double number)

Method Source Code

//package com.java2s;
/*/*w  w  w.  ja va2  s  .c  o m*/
 * (c) Copyright 2008-2010 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 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 {
    /**
     * Returns the number of digits needed for displaying the postfix values of a number, but at most 7.
     * @param number
     * @return the number of digits needed for displaying the postfix values of a number, but at most 7
     */
    public static int fractionDigits(double number) {
        double x = fraction(number);
        int n = 0;
        while (x >= 0.0000001 && n < 7) {
            n++;
            x = fraction(x * 10);
        }
        return n;
    }

    private static double fraction(double number) {
        double value = Math.IEEEremainder(Math.abs(number), 1);
        if (value < 0)
            value += 1;
        return value;
    }
}