Yea that makes sense now after I read about the fp accuracy in CPUs, thanks!
----- Original Message -----
From: "Rory Daulton" <[EMAIL PROTECTED]>
To: "Delphi-Talk Discussion List" <[email protected]>
Sent: Friday, August 05, 2005 8:53 AM
Subject: Re: bad floaters in a floating point value
> Richard,
>
>> Hi. I am developing plugins for Caligari Truespace software. The plugins
>> are DLL's and use MFC. Primitive Itch developed a Delphi wrapper, and I
>> helped provide translations from the vc++ header files. The wrapper
>> contains exports from the tsxapi.dll which the Truespace application uses
>> for plugins. Using this wrapper, I can create DLL's for the extension of
>> the Truespace application. The problem I am having is with the floating
>> point values in the type float. They are making it hard to do checks. An
>> example, I get a value from a dll function that supposed to return 4.47
>> for a specific setting in the application. Well when I read this value,
>> it
>> reads like 4.46999999999997 and I get many similar problems like this. I
>> have tried doing variable:= StrToFloat(Format('%.2f', [variable]));
>> however it returns the same value. What can I do about this? I need to
>> check for 4.47 yet its always returning false because of the inaccuracy.
>> Thanks,
>
> Instead of checking like this:
> if Val = 4.47 then ...
>
> do something like this:
> if Abs(Val - 4.47) < 1e-4 then ...
>
> Rory Daulton
> [EMAIL PROTECTED]
>
>
> -------------------------------------------------------------------------------
> [This e-mail scanned for viruses and spam by Nmax - "Your MAXimum
> Connection!"]
>
> __________________________________________________
> Delphi-Talk mailing list -> [email protected]
> http://www.elists.org/mailman/listinfo/delphi-talk
>
__________________________________________________
Delphi-Talk mailing list -> [email protected]
http://www.elists.org/mailman/listinfo/delphi-talk
