Java Number Round roundSig(double d, int n)

Description

round Sig

License

Apache License

Declaration

public static double roundSig(double d, int n) 

Method Source Code

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

public class Main {
    public static double roundSig(double d, int n) {
        if (d != d) {
            return Double.NaN;
        }/*  w  w w.  j av a2  s. com*/
        if (d == 0) {
            return 0;
        }
        int power = n - (int) Math.ceil(Math.log10(d < 0 ? -d : d));
        double magnitude = Math.pow(10, power);
        return Math.round(d * magnitude) / magnitude;
    }

    public static double round(double d, int decimals) {
        if (d != d) {
            return Double.NaN;
        }
        double n = Math.pow(10, decimals);
        return Math.round(d * n) / n;
    }

    public static double round(double d, double fraction) {
        if (d != d) {
            return Double.NaN;
        }
        return Math.round(d * fraction) / fraction;
    }
}

Related

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2. roundScale(double value, int scale)
3. roundScale2(Number number)
4. roundSec(int sec)
5. roundSec(long milli)
6. roundSignificant(double d, int numDigit, boolean keepInteger)
7. roundSignificant(double value)
8. roundSimpleNumberUnits(final long graphDefaultUnit)
9. roundSizes(float[] sizes)