Re: Rounding doubles in Java?

["Larry Meadors" <lmeadors@xxxxxxxxxxxxx>]

I'm sorry, maybe I missed something here.

Besides being more code to maintain, how is this different from casting 
Math.round() to double?

public static void testmathround(){
        double x;
        x = 25.56;
        System.out.println("Math.round(" + x + ") = " + (double)Math.round(x));
        x = -25.56;
        System.out.println("Math.round(" + x + ") = " + (double)Math.round(x));
        x = 25.1;
        System.out.println("Math.round(" + x + ") = " + (double)Math.round(x));
        x = -25.1;
        System.out.println("Math.round(" + x + ") = " + (double)Math.round(x));
        x = 25.0;
        System.out.println("Math.round(" + x + ") = " + (double)Math.round(x));
        x = -25.0;
        System.out.println("Math.round(" + x + ") = " + (double)Math.round(x));
}


Math.round(25.56) = 26.0
Math.round(-25.56) = -26.0
Math.round(25.1) = 25.0
Math.round(-25.1) = -25.0
Math.round(25.0) = 25.0
Math.round(-25.0) = -25.0
round(25.56) = 26.0
round(-25.56) = -26.0
round(25.1) = 25.0
round(-25.1) = -25.0
round(25.0) = 25.0
round(-25.0) = -25.0

>>> chefen@kodefabrikken.dk 09/08/00 01:32AM >>>
Hi!

If you want rounding to the nearest higher/lower integer value depending
on the value of the fraction you can use the method round() shown below:

public class TestRounding
{
 public static double round(double val)
 {
  return val >= 0.0 ? Math.floor(val + .5) : Math.ceil(val - .5);
 }

    public static void main(String args[])
    {
        double val;

  // Round up.
  // ---------
        val = 25.56;
        System.out.println("round(" +val +") = " +round(val));
        val = -25.56;
        System.out.println("round(" +val +") = " +round(val));

  // Round down.
  // -----------
        val = 25.1;
     System.out.println("round(" +val +") = " +round(val));
        val = -25.1;
     System.out.println("round(" +val +") = " +round(val));

  // No rounding.
  // ------------
        val = 25.0;
     System.out.println("round(" +val +") = " +round(val));
        val = -25.0;
     System.out.println("round(" +val +") = " +round(val));
 }
}

I hope that it is what you are asking

Thorbjørn
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