Mike
I got a real kick out of your theological predicates in the Sept. '86
issue. Tried to convert for Turbo Prolog and ran into a problem with "variable
is not bound in this clause". I can press <F10> and go on anyway to get the
desired solution. Have you written a TPro version? Here's what I came up
with:
/* Theological program from Sept. '86 DDJ */
predicates
can(symbol,symbol,symbol)
omnipotent(symbol)
indestructible(symbol)
clauses
can(X,_,_) :- omnipotent(X).
omnipotent(god).
indestructible(X) :- not (can(_,destroy,X)).
You can ask about a particular thing: "can(god,create,thing), indestructible
(thing)" and get an unsatisfying answer of "False". But if you use a variable
in place of "thing", TProlog gives the above-mentioned warning. Pressing on,
the query "can(god,create,X), indestructible(X)" gives "No Solution" -better?
— Neil