Integer comparison
Juergen Bullinger
juergen.bullinger at gmx.net
Tue Feb 17 22:48:21 UTC 2004
Hallo all,
I just tried out squeak.
I use Smalltalk for private number theoretical observations.
Maybe it sounds odd, but I am used to Smalltalk (I use VA in my job) and
I recognized that it is rather fast on large number computations.
For example I computed a prime number with > 700 digits in Smalltalk in
about 20 hours on a Pentium III machine :o)
So far I used VA for that but wanted to take a look also at other
flavours. Squeak is interesting, because it has cross compilation
capabilities if i am right.
I know of squeak since some years and actually tried it out some years
ago and I was very surprised when I looked at the new version. It seems
to have gone a far way.
On my trials I found out, that values of large postive integer don't
equal values of integer even if the values represent the same value.
Is this behaviour intended?
For example:
(5883377743366005002288555544466433777 \\\ 2) =
(5883377743366005002288555544466433777 \\ 2)
results in false, although both expression answer 1, but the first
expression answers a large postive int(1) and the last a int(1).
I just wanted to to do some performance comparisons between VA and
Squeak and recognized that \\\ performs faster than \\ but I was not
sure if it does what i intended, so I implemented a loop comparing the
results of this two operations.
I wanted to change this behaviour myself, but I recognized that = uses a
primitive implementation and if you want to change that behaviour you
might want to do it there?!
Thank you in advance
Juergen
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