Need help with Java( on the double )

stewy_w · Post by **stewy_w** » 05 Nov 2004, 13:12

Anyone, plz help me asap

how do I round off to two decimal places in java(the datatype is double).
I tried using DecimalFormat but i get errors.
i am stuck because of this

please help

ckritntt · Post by **ckritntt** » 05 Nov 2004, 13:53

EG.
double d = 3.46434;

DecimalFormat twoDigits = new DecimalFormat();
double f = 0.00;
f = twoDigits.Format(d);

But make sure that you apply this mechanism so that all your double variables for you crafter's,product's and crafter product's look the same.

stewy_w · Post by **stewy_w** » 08 Nov 2004, 10:26

ckritntt wrote: f = twoDigits.Format(d);

what's the d for?

Post by **wit_skapie** » 08 Nov 2004, 10:29

Eish .... it's the number you want to format... check the example : double d = 3.46434;

Nerevar · Post by **Nerevar** » 08 Nov 2004, 20:02

or use

lets say

c.print(num1);
c.print(0,2);

RuadRauFlessa · Post by **RuadRauFlessa** » 09 Nov 2004, 16:28

Take note that the print and printf functions are only available in JDK5. The formatting within these two methods occurs exactly the same as in c's cprintf and cprint methods.

Anyway I would be more interested in seing the code that causes your problem and then trying to correct that than giving you a couple of examples.

rustypup · Post by **rustypup** » 13 Dec 2004, 15:56

RuadRauFlessa wrote:Anyway I would be more interested in seing the code that causes your problem and then trying to correct that than giving you a couple of examples.

Agreed....

Problem : The alg used to handle rounding for doubles is prone to NaN or Infinity on certain cpu's.... ignore this at your own peril. You can check for these using the static methods Double.isNaN(dble) or Double.isInfinity(dble)....

Consider using BigDecimal or BigInteger in double precision ops....

RuadRauFlessa · Post by **RuadRauFlessa** » 13 Dec 2004, 15:59

Ello Rustypup. I weould like to welome you to the forums on behalf of all the moderators over here. Hope you have a plesent stay mate

rustypup · Post by **rustypup** » 13 Dec 2004, 16:04

RuadRauFlessa wrote:Ello Rustypup. I weould like to welome you to the forums on behalf of all the moderators over here. Hope you have a plesent stay mate

I'm sure I will.... spend most days at jtech..... thought I'd give the locals a chance to make me look blonder than I already am...

RuadRauFlessa · Post by **RuadRauFlessa** » 13 Dec 2004, 16:07

We are all mates here, We laugth,play and shout together.

Keep the source flowing man I gotta get back to work.