Re: Question about TomEE and OpenEJB.

[Romain Manni-Bucau]

You can have a look to BigDecimal, and some 3rd party libraries like gmp
(there are java bindings). But JavaEE isnt linked to that at all.

Le 13 mars 2018 05:58, "David Jencks"  a écrit :

> As Romain said in response to your previous question, the capabilities
> provided as part of any software implemented on top of the jre, such as
> tomee or openejb, don’t affect arithmetic operations in the jre in any way.
> After carefully analyzing your actual needs you might investigate the
> BigInteger and BigDecimal classes to see if they will support whatever you
> are trying to do.  I don’t think you will find any way to exactly model the
> set of real numbers, rational numbers, or even integers on any computer
> built now or in the future.
>
> Btw while not an expert I don’t think your example illustrates overflow of
> underflow but rather that decimal fractions can’t be converted accurately
> to finite binary fractions. This is why eg cobol used binary coded decimal.
>
> David Jencks
> Sent from my iPhone
>
> > On Mar 12, 2018, at 8:37 PM, A Z  wrote:
> >
> > -Do floats and doubles in TomEE, as well as in OpenEJB,
> >
> > still have the same floating point overflow and underflow
> >
> > arithmetic phenomena as in Java Standard Edition?
> >
> >
> > -I refer to the following kind of phenomonen:
> >
> >
> > Double a = 0.1;
> >
> >
> > Double b = 0.1;
> >
> >
> > Double x = a*b;
> >
> >
> > out.println(x == 0.01); //actually prints false.
> >
> >
> >
> > -Do TomEE or OpenEJB have some option to get
> >
> > rid of overflow and underflow entirely, by means of some kind
> >
> > of option?  If so, what is that?
> >
> >
> >
>

Re: Question about TomEE and OpenEJB.

[David Jencks]

As Romain said in response to your previous question, the capabilities provided 
as part of any software implemented on top of the jre, such as tomee or 
openejb, don’t affect arithmetic operations in the jre in any way. After 
carefully analyzing your actual needs you might investigate the BigInteger and 
BigDecimal classes to see if they will support whatever you are trying to do.  
I don’t think you will find any way to exactly model the set of real numbers, 
rational numbers, or even integers on any computer built now or in the future.

Btw while not an expert I don’t think your example illustrates overflow of 
underflow but rather that decimal fractions can’t be converted accurately to 
finite binary fractions. This is why eg cobol used binary coded decimal.

David Jencks 
Sent from my iPhone

> On Mar 12, 2018, at 8:37 PM, A Z  wrote:
> 
> -Do floats and doubles in TomEE, as well as in OpenEJB,
> 
> still have the same floating point overflow and underflow
> 
> arithmetic phenomena as in Java Standard Edition?
> 
> 
> -I refer to the following kind of phenomonen:
> 
> 
> Double a = 0.1;
> 
> 
> Double b = 0.1;
> 
> 
> Double x = a*b;
> 
> 
> out.println(x == 0.01); //actually prints false.
> 
> 
> 
> -Do TomEE or OpenEJB have some option to get
> 
> rid of overflow and underflow entirely, by means of some kind
> 
> of option?  If so, what is that?
> 
> 
>