Math round java

Question

I got project do convert from cm to inch. I did it: how can i round my number with Math.round?

import java.util.Scanner;  

public class Centimer_Inch
{

public static void main (String[] args)
{
        // 2.54cm is 1 inch
       Scanner cm = new Scanner(System.in); //Get INPUT from pc-Keyboard
       System.out.println("Enter the CM:"); // Write input
       //double
       double centimeters = cm.nextDouble();
       double inches = centimeters/2.54;
       System.out.println(inches + " Inch Is " + centimeters + " centimeters");


    }
}

Answer 1

You could do something like this:

Double.valueOf(new DecimalFormat("#.##").format(
                                           centimeters)));  // 2 decimal-places

If you really wanted Math.round:

(double)Math.round(centimeters * 100) / 100  // 2 decimal-places

You can have 3 decimal places by using 1000, 4 by using 10000 etc. I personally like the first option more.