Java Double Number Divide toPercent(long divisor, long dividend)

Description

to Percent

License

Apache License

Declaration

public static double toPercent(long divisor, long dividend) 

Method Source Code

//package com.java2s;
/**/*from  w  ww. j  a v  a 2  s  . co m*/
 * Copyright 2008 - 2009
 * 
 * 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.
 * 
 * @project loonframework
 * @author chenpeng
 * @email?ceponline@yahoo.com.cn
 * @version 0.1
 */

import java.math.BigDecimal;

public class Main {

    public static double toPercent(long divisor, long dividend) {
        if (divisor == 0 || dividend == 0) {
            return 0d;
        }
        double cd = divisor * 1d;
        double pd = dividend * 1d;

        return (Math.round(cd / pd * 10000) * 1d) / 100;
    }

    public static double round(double v, int scale) {
        if (scale < 0) {
            throw new IllegalArgumentException("The scale must be a positive integer or zero");
        }

        BigDecimal b = new BigDecimal(Double.toString(v));
        BigDecimal one = new BigDecimal("1");
        return b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
    }
}

Related

1. divZ(double z)
2. getIntDividedCeil(final int nDividend, final int nDivisor)
3. getLongDivided(final long nDividend, final long nDivisor, @Nonnull final RoundingMode eRoundingMode)
4. roundDivide(double[] dividend, double[] divisor, int scale)
5. safeDivide(long dividend, long divisor)