Morning all,
I managed to do a bit of experimenting on the INT(x) problem last night.
Counting down gave the following results:
3.03 3
3.02 3
3.01 3 The correct result for 3 this time is because the
3 3 internal value printed as 3 will be slightly higher
2.99 2 and rounded down.
2.98 2
2.97 2
2.96 2
2.95 2
The results for negative numbers are strange and I can't attribute this
to
rounding. I wonder if the original QL would have given the same
results using it's software floating point routines instead of the
68040's FPU.
-2.95 -3 -3.03 -4
-2.96 -3 -3.02 -4
-2.97 -3 -3.01 -4
-2.98 -3 -3 -3
-2.99 -3 -2.99 -3
-3 -3 -2.98 -3
-3.01 -4 -2.97 -3
-3.02 -4 -2.96 -3
-3.03 -4 -2.95 -3
I was hoping to try an equivalent test in C and Assembler using the
68040 FINT and FINTRZ instructions but didn't have time.
Ian.
> -----Original Message-----
> From: zeljko.nastasic
> Sent: 18 June 2001 16:43
> To: ql-users
> Cc: zeljko.nastasic
> Subject: RE: [ql-users] NEXT in FOR-loop
>
>
> On 6/18/01 at 3:44 PM Claude Mourier 00 wrote:
>
> >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$(n, 9, 8) returns 3.00000.
> >
> >Claude
>
> No, it's Print. Eventually, you have to print it and that's where the
> rounding happens. FDEC$ does an implicit print, so again you
> cannot escape
> rounding. The only way would be to get the actual float
> representation from
> memory as 6 bytes and convert them 'manually'.
>
> Nastan
>
>
Visit our website at http://www.ubswarburg.com
This message contains confidential information and is intended only
for the individual named. If you are not the named addressee you
should not disseminate, distribute or copy this e-mail. Please
notify the sender immediately by e-mail if you have received this
e-mail by mistake and delete this e-mail from your system.
E-mail transmission cannot be guaranteed to be secure or error-free
as information could be intercepted, corrupted, lost, destroyed,
arrive late or incomplete, or contain viruses. The sender therefore
does not accept liability for any errors or omissions in the contents
of this message which arise as a result of e-mail transmission. If
verification is required please request a hard-copy version. This
message is provided for informational purposes and should not be
construed as a solicitation or offer to buy or sell any securities or
related financial instruments.
