Java Double Number Round roundAndScale(double startValue, int places)

Description

round And Scale

License

Open Source License

Declaration

public static double roundAndScale(double startValue, int places) 

Method Source Code

//package com.java2s;

public class Main {
    public static double roundAndScale(double startValue, int places) {

        double multiplier = calculateMultiplier(places);
        double ourNoughtPointFive = 0.50000000001;
        double absoluteValue = Math.abs(startValue);
        double valueToBeFloored = (absoluteValue * multiplier) + ourNoughtPointFive;
        double roundedValue = Math.floor(valueToBeFloored);
        double returnValue = roundedValue / multiplier;
        if (startValue < 0)
            returnValue = -returnValue;//from www  .  j  a  v  a  2s  . c om
        return returnValue;

    }

    private static double calculateMultiplier(int scale) {
        double retval = 1;
        for (int i = 0; i < scale; i++) {
            retval = retval * 10;
        }
        return retval;
    }
}

Related

1. round2(int a, int preserveDigits)
2. round2Places(Double input)
3. round5(final double value)
4. round_double(double d)
5. round_nearestmultipleof5(double value)
6. roundAngle(double a, long n)
7. roundAtDecimals(double number, int deci)
8. roundAway(double d)
9. roundAwayFromZero(double num)