[fpc-pascal] Freepascal Floating Point Issue

[Bernd.Oppolzer at t-online.de]

https://www.facebook.com/notes/new-stanford-pascal-compiler/floating-point-output-differences-between-platforms/365845753799072
<https://www.facebook.com/notes/new-stanford-pascal-compiler/floating-point-output-differences-between-platforms/365845753799072> 
/

other Pascal Implementations have to provide solutions to this issue, too

Kind regards

Bernd



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--- Original-Nachricht ---
Von: Sven Barth via fpc-pascal
Betreff: Re: [fpc-pascal] Freepascal Floating Point Issue
Datum: 22.08.2017, 7:54 Uhr
An: FPC-Pascal users discussions
Cc: Sven Barth



Am 22.08.2017 00:02 schrieb "James Richters" <
james at productionautomation.net <mailto:james at productionautomation.net> >:

The others already wrote about floating point precision, so I won't repeat 
that.

> The reason I noticed this is because I have some conditional statements 
like
> If Draw_GX_Min<>99.999 then
>     Something....

*DON'T* compare floating point numbers like that. Instead use SameValue() 
from the Math unit which has an additional epsilon value (with a default 
value) that defines a lower and upper bound from your desired value to 
compare to.

Regards,
Sven
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