> ... But this is quite annoying :
Yes :-), but whenever you use irrational numbers (cannot be represented
exactly in a limited precision number system) you will encounter this
problem and any solution will have to be a compromise. Personally I
prefer the rounding because that way there is some spare precision to
delay accumulated errors showing up in printed results. I'll try and
find the time to do some experiments this evening. I really ought to
get on with some work now though!
Ian.
> -----Original Message-----
> From: CMOUR
> Sent: 18 June 2001 14:45
> To: ql-users
> Cc: CMOUR
> Subject: RE: [ql-users] NEXT in FOR-loop
>
>
> Thank's a lot for all the answers. But this is quite annoying
> : especially
> because behavior is not the same for PRINT and INT. Better if
> PRINT returns
> something like 2.99999 (in fact SMS loves exponential form I personaly
> hate). I'm not sure but I think even FDEC$(n, 9, 8) returns 3.00000.
>
> Claude
>
> -----Message d'origine-----
> De : ZN [mailto:[EMAIL PROTECTED]]
> Envoy� : lundi 18 juin 2001 15:36
> � : [EMAIL PROTECTED]
> Objet : Re: [ql-users] NEXT in FOR-loop
>
>
> >> As I see a question about FOR/NEXT loops, I have mine:
> >> the subsequent peice of code gives me an unexpected result
> >> FOR n = 2.95 to 3.05 STEP 0.01 : print n, INT(n)
> >> Why ?
>
> >Only guessing because I can't try this until I get home, but when n
> >reaches the value 2.9999.... (the nearest it'll get to 3.00 because
> >0.01 is not represented exactly internally [that would need
> an infinite
> >number of bits]), then PRINT n will round up to 3, whereas
> INT(n) will
> >return the correct answer (2) which needs no rounding and therefore
> >prints as 2.
>
> Print returns 3 because of rounding of the QL float precision
> of >9 digits
> to 7 digits available for printing. INT operates directly
> from QL float
> format and will therefore give the right result: 2. This will again be
> rounded to 7 digitsby print but obviously 2.0000000 =
> 2.000000 so nothing
> will change.
>
> Nasta
>
>
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