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Re: Regarding banking software

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On Tuesday, October 2, 2012 2:05:00 PM UTC-5, Peter Duniho wrote:
> On Tue, 2 Oct 2012 11:59:01 -0700 (PDT), bob smith wrote:
> 
> 
> 
> > On Tuesday, October 2, 2012 11:20:03 AM UTC-5, Peter Duniho wrote:
> 
> >> On Tue, 2 Oct 2012 07:18:51 -0700 (PDT), bob smith wrote:
> 
> >> 
> 
> >> 
> 
> >> 
> 
> >>> [...]
> 
> >> 
> 
> >>>> Better just avoid float and double completely when dealing with money!
> 
> >> 
> 
> >>> And how will you be calculating interest ?
> 
> >> 
> 
> >> With a proper decimal numeric format.  E.g. BigDecimal.  These exist
> 
> >> 
> 
> >> precisely because of this specific issue.
> 
> > 
> 
> > Don't you need to be able to raise to a floating point power for interest?  (i.e. not an integer)
> 
> 
> 
> For example?
> 
> 
> 
> All my banks simply compute simple interest periodically, compounding as
> 
> necessary.  It's straight multiplication, no exponents necessary.
> 
> 
> 
> When is a "floating point power" needed?  And if it's needed, what is to
> 
> preclude one from writing a proper decimal implementation rather than
> 
> improperly using float or double for financial computations?

If you are just compounding daily, then maybe you don't need it.

However, it you want to compound continuously, I think you will need it.  (   To use P*e^(r*t)    )

And, good luck representing e with your BigDecimal class.

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Regarding banking software Navnath Gadakh <navnathgadakh@gmail.com> - 2012-09-30 21:25 -0700
  Re: Regarding banking software Roedy Green <see_website@mindprod.com.invalid> - 2012-10-01 10:26 -0700
    Re: Regarding banking software Arne Vajhøj <arne@vajhoej.dk> - 2012-10-01 19:43 -0400
  Re: Regarding banking software bob smith <bob@coolfone.comze.com> - 2012-10-01 13:10 -0700
    Re: Regarding banking software Lew <lewbloch@gmail.com> - 2012-10-01 13:59 -0700
      Re: Regarding banking software Arne Vajhøj <arne@vajhoej.dk> - 2012-10-01 19:46 -0400
    Re: Regarding banking software Arne Vajhøj <arne@vajhoej.dk> - 2012-10-01 19:44 -0400
      Re: Regarding banking software bob smith <bob@coolfone.comze.com> - 2012-10-02 07:18 -0700
        Re: Regarding banking software Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-10-02 09:19 -0700
          Re: Regarding banking software bob smith <bob@coolfone.comze.com> - 2012-10-02 11:59 -0700
            Re: Regarding banking software Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-10-02 12:04 -0700
              Re: Regarding banking software bob smith <bob@coolfone.comze.com> - 2012-10-02 13:00 -0700
                Re: Regarding banking software Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-10-02 13:34 -0700
                Re: Regarding banking software bob smith <bob@coolfone.comze.com> - 2012-10-02 14:22 -0700
                Re: Regarding banking software Peter Duniho <NpOeStPeAdM@NnOwSlPiAnMk.com> - 2012-10-02 14:40 -0700
                Re: Regarding banking software glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-10-02 22:44 +0000
                Re: Regarding banking software Lew <lewbloch@gmail.com> - 2012-10-02 15:52 -0700
                Re: Regarding banking software Gene Wirchenko <genew@ocis.net> - 2012-10-02 14:55 -0700
            Re: Regarding banking software David Lamb <dalamb@cs.queensu.ca> - 2012-10-02 21:48 -0400
  Re: Regarding banking software Arne Vajhøj <arne@vajhoej.dk> - 2012-10-01 19:40 -0400
  Re: Regarding banking software David Lamb <dalamb@cs.queensu.ca> - 2012-10-01 22:41 -0400
  Re: Regarding banking software Jeff Higgins <jeff@invalid.invalid> - 2012-10-02 03:25 -0400

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