[DUG] Need help with trunc command delphi 6

[Kyley Harris]

Another common issue I've had with doubles is

x := 0

x = 0 can somtimes return false and the debugger might show 0.00000000001 or
something as a value even though it was hardcoded.

I now use routines like NearZero (just an example name) which rounds test
values to a a reasonable test DP.

On Wed, Dec 30, 2009 at 11:19 PM, Kyley Harris <Kyley at harrissoftware.com>wrote:

> Doubles and extendeds have always had minor rounding issues and other
> little things depending on the OS, and Hardware that its running on. The
> Currency is a special case which uses whole numbers rather than fractions
> for arithmetic. Its supposed to be guaranteed accurate to 4dp and they are
> not processed in the same way.
>
>
> On Wed, Dec 30, 2009 at 9:42 PM, Vikas... <vikas.image at gmail.com> wrote:
>
>> Hi Edward,
>>
>> I use extended for both.
>>
>> does it cause problem?
>>
>>
>> On Wed, Dec 30, 2009 at 1:24 PM, Edward Koryagin <ed_iv2001 at yahoo.co.nz>wrote:
>>
>>> Use currency and everything should be fine.
>>>
>>> Edward Koryagin
>>>
>>>
>>> --- On Wed, 30/12/09, Edward Koryagin <ed_iv2001 at yahoo.co.nz> wrote:
>>>
>>> > From: Edward Koryagin <ed_iv2001 at yahoo.co.nz>
>>> > Subject: Re: [DUG] Need help with trunc command delphi 6
>>> > To: "NZ Borland Developers Group - Delphi List" <delphi at delphi.org.nz>
>>> > Received: Wednesday, 30 December, 2009, 8:28 PM
>>> > What data types do you use for 4.5
>>> > and 0.1?
>>> >
>>> > Edward Koryagin
>>> >
>>> >
>>> > --- On Wed, 30/12/09, Vikas... <vikas.image at gmail.com>
>>> > wrote:
>>> >
>>> > > From: Vikas... <vikas.image at gmail.com>
>>> > > Subject: [DUG] Need help with trunc command delphi 6
>>> > > To: delphi at delphi.org.nz
>>> > > Received: Wednesday, 30 December, 2009, 8:00 PM
>>> > > Hello everyone,
>>> > >
>>> > > I am facing one strange problem here. We are using a
>>> > > banking teller application ,here we do calculation
>>> > based on
>>> > > denominations in short.
>>> > >
>>> > > My main problem is when we use this application for
>>> > long
>>> > > time with out closing it the trunc start giving
>>> > incorrect
>>> > > value what i mean is
>>> > >
>>> > >
>>> > > quantity := trunc(amount/value).
>>> > >
>>> > > Sometime when amount = let say 4.5 and value =0.1 it
>>> > gives
>>> > > like
>>> > >
>>> > > quantity := trunc(4.5/0.1)=44 which is wrong since my
>>> > > client complain it make them lose of 1 dollar amount.
>>> > >
>>> > >
>>> > > However when i close the application and do again all
>>> > works
>>> > > fine.
>>> > >
>>> > > Anyone ever faced this problem before  , or anyone
>>> > know
>>> > > any substitute for trunc which works
>>> > > I am using delhi6
>>> > >
>>> > > Appreciate your help
>>> > >
>>> > >
>>> > > regards
>>> > > vik
>>> > >
>>> > > --
>>> > >   vikas
>>> > >
>>> > >
>>> > > -----Inline Attachment Follows-----
>>> > >
>>> > > _______________________________________________
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>>> > > Post: delphi at delphi.org.nz
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>>> >
>>> >
>>> >
>>> >
>>> >
>>> > _______________________________________________
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>>> >
>>>
>>>
>>>
>>>
>>>
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>>>
>>
>>
>>
>> --
>>  vikas
>>
>> _______________________________________________
>> NZ Borland Developers Group - Delphi mailing list
>> Post: delphi at delphi.org.nz
>> Admin: http://delphi.org.nz/mailman/listinfo/delphi
>> Unsubscribe: send an email to delphi-request at delphi.org.nz with Subject:
>> unsubscribe
>>
>
>
>
> --
> Kyley Harris
> Harris Software
> +64-21-671-821
>



-- 
Kyley Harris
Harris Software
+64-21-671-821
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