Help - Rounding Double Value to 1d.p

Question

Hi there, I have a value which is going to be entered via keyboard it will be something like $309.99 or $856.87 and I need it to be rounded to the nearest 10C. E.g $309.99 would become $310.00 and $856.87 -> $856.90
It doesn't even need to be at 1d.p but just round up to nearest 10C...
Any help will be greatly appreciated..
Thanks..

Answer 1

I need it to be rounded to the nearest 10C.It's not quite clear what you mean by this. Should the number itself change to
the nearest 0.1 of a dollar? Or should string used to display the number
be made to resemble the examples you give ($310.00 etc)? The two
things are very different, although both could be described as "rounding".
public class RoundEg {
     public static void main(String[] args) {
          double d = 12.345;
               // creates the string "$12.30"
          String s = String.format("$%.1f0", d);
          System.out.println(d + " --> " + s);
               // changes d to 12.3
          d = Math.round(d * 10) / 10.0;
          System.out.println(d);
}String.format() is 1.5, you might also have a look at the DecimalFormat class.