Java Number Divide divRate(double v1, double v2)

Description

div Rate

License

Apache License

Declaration

public static String divRate(double v1, double v2) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.math.BigDecimal;

public class Main {
    private static final int DEF_DIV_SCALE = 10;

    public static String divRate(double v1, double v2) {
        double d = div(v1, v2, DEF_DIV_SCALE);
        double r = mul(d, 100);
        return r + "%";
    }/*w ww  . j  a v  a2  s. co  m*/

    public static String divRate(double v1, double v2, int scale) {
        double d = div(v1, v2, scale);
        double r = mul(d, 100);
        return r + "%";
    }

    public static double div(double v1, double v2) {
        return div(v1, v2, DEF_DIV_SCALE);
    }

    public static double div(double v1, double v2, int scale) {
        if (scale < 0) {
            throw new IllegalArgumentException("The   scale   must   be   a   positive   integer   or   zero");
        }
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
    }

    public static double mul(double v1, double v2) {
        BigDecimal b1 = new BigDecimal(Double.toString(v1));
        BigDecimal b2 = new BigDecimal(Double.toString(v2));
        return b1.multiply(b2).doubleValue();
    }
}

Related

1. divideBy(Number number1, Number number2)
2. divideByRoundDown(Number number1, Number number2)
3. division(Number numerator, Number denominator)
4. divmod(byte[] number, int firstDigit, int base, int divisor)
5. divmod256(byte[] number58, int startAt)
6. isDivisible(Double a, int b, int decimal)