I think Alexander Bogomolny wrote:
>
> In addition, the 2-rules example on pp. 22-23 is confusing. Since the
> discussion is about the order of execution, implicit in the example is
> the possibility of both rules firing in sequence. It is therefore a
> mistake to suggest that the second rule ("stop") should fire before the
> first rule ("go"). Unless the firing of the second rule somehow removes
> the first one from the agenda - and the need to do that is not brought
> up in the discussion - the net result ("go") would the the opposite of
> the desired.
The rules are written in English, which implies less precision than a
real programming language, so I'm not sure I agree that things need to
be spelled out in this level of detail; but are you suggesting,
perhaps, that the second rule should say something like
IF
a person is in front of you
THEN
stop until they get out of the way
END
instead of just "stop"?
A final note: although these discussions are welcome here, there's
also Manning's "Author Online" bulletin board for the book, where
they're perhaps even more appropriate.
http://www.manning-sandbox.com/forum.jspa?forumID=35
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Ernest Friedman-Hill
Science and Engineering PSEs Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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