Java Number Round roundUp(final double val)

Description

Given a number, round up to the nearest power of ten times 1, 2, or 5.

License

Apache License

Parameter

Parameter	Description
val	the number, it must be strictly positive

Declaration

private static double roundUp(final double val) 

Method Source Code

//package com.java2s;
/**/*from   w  w  w.j a v a 2 s  . co  m*/
 * Copyright (C) 2009 - 2013 SC 4ViewSoft SRL
 *  
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Given a number, round up to the nearest power of ten times 1, 2, or 5.
     * 
     * @param val the number, it must be strictly positive
     */
    private static double roundUp(final double val) {
        int exponent = (int) Math.floor(Math.log10(val));
        double rval = val * Math.pow(10, -exponent);
        if (rval > 5.0) {
            rval = 10.0;
        } else if (rval > 2.0) {
            rval = 5.0;
        } else if (rval > 1.0) {
            rval = 2.0;
        }
        rval *= Math.pow(10, exponent);
        return rval;
    }
}

Related

1. roundUP(double d)
2. roundUp(double n)
3. roundUp(double n, int precision)
4. roundUp(double val)
5. roundUp(double val)
6. roundUp(final int number, final int base)
7. RoundUp(final T number)
8. roundUp(int capacity)
9. roundUp(int dividend, int divisor)