[fpc-pascal] Re: Why this evaluates on "if" wrong ?

[Daniël Mantione]

Op Mon, 29 Oct 2007, schreef Stephen Dickason:

> > It's just one more funny thing one must realize,
> > when comparing real numbers with some exact
> > real constants. After this, I will try to never
> > compare doubles directly, but using tricks like
> > above. Because, in this digital world
> > 1 + 0.4 - 0.4 <> 1.
> 
> In binary that is 00000001 + 0.0110011001100.... - 0.0110011001100.... because
> we hit recurring decimals a lot more in binary than decimal.  I wonder why we
> don't have a standard format (maybe we do?) that factors in the remainder as
> part of the number also? 

The answer can be found in the fact that any number with recurring 
decimals is a rational number and therefore does not need floating point 
numbers.

Daniël