Java Double Number Round round(double d)

Description

Rounds the number to 4 significant digits

License

Open Source License

Declaration

public static double round(double d) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /** Rounds the number to 4 significant digits */
    public static double round(double d) {
        if (d == 0.0)
            return d;
        int digits = (int) (Math.log(d) / Math.log(10));
        return round(d, 3 - digits);
    }//from   w  ww.j  a  v  a2s .  c om

    /** Rounds the number to n decimal places */
    public static double round(double d, int n) {
        double shift = Math.pow(10, n);
        return ((double) ((long) (d * shift + 0.5))) / shift;
    }
}

Related

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