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  Using double on cldc 1.0  (Read 1650 times)
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Offline sblantipodi

Senior Newbie




Java games rock!


« Posted 2004-12-26 17:41:17 »

Hello.
I'm trying to manage double numbers on my cldc 1.0 devices. (Motorola V620 phone).

I know that to do that I need an external library like MathFP or MicroDouble.
MathFP haven't all the method that I need.
MicroDouble is what I need but I'm not able to use it.

Is there someone that can help me using it?
A piece of code to implement this library and a simple explanation on how to do that.

It can be enough also a piece of code that add only to double numbers.
Example:

2.5+2.8=5.3
This code is enough.
Please help me
Offline sblantipodi

Senior Newbie




Java games rock!


« Reply #1 - Posted 2004-12-27 17:59:50 »

Bump!
Offline Herkules

Senior Member




Friendly fire isn't friendly!


« Reply #2 - Posted 2004-12-29 06:46:25 »

No idea what CDLC is, but from a one second glance to the MicroDouble doc:

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long res = MicroDouble.add( new MicroDouble("2.5").doubleValue(), new MicroDouble("2.8").doubleValue() );



2 second look:

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long res = MicroDouble.add( MicroDouble.parseDouble("2.5"), MicroDouble.parseDouble("2.8"));


If used often, I'd personally write (the author did not make the class final  ):

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2  
3  
class D extends MicroDouble{}

long res = D.add( D.parseDouble("2.5"), D.parseDouble("2.8"));
Wink

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Offline Falken

Senior Newbie




biggidy bong


« Reply #3 - Posted 2004-12-30 13:36:06 »

(This thread would be better served in the J2ME forum section)

Presumably if you were to use MathFP it could be written like this:-
long a = MathFP.toFP("2.5");
long b = MathFP.toFP("2.8");
long result = MathFP.add(a, b);
(editted: my previous attempt was wrong)

But Herks solution is much easier to read.

There are many good tutorials about fixed-point math available, and it is always worth studying, but now that CLDC-1.1 is slowly becoming common-place it can be skipped should you wish to avoid it.
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