Re: Syntax Error in GNU Prolog 1.2.16

Hi, I tried removing the parentheses from the dynamic facts. I get the
same error as previously for loc_list/2, I get the following warning
for turned_off/1:

warning: unknown directive (/)/2 - maybe use initialization/1 -
directive ignored

....and the following error for the rest of the dynamic facts:

error: syntax error: . or operator expected after expression (char:11)

As far as not, I have in my code the rule:

not(X) :- \+(X).

....so using not shouldn't be a problem.

I'm actually doing the tutorial at
http://www.amzi.com/AdventureInProlog/index.htm which is very similar
to the info in the link you sent.

Thanks,
A

Darren Bane wrote:
amill123@xxxxxxxxx wrote:
I have some facts in a program that I am running under GNU Prolog that
I am trying to declare as dynamic. Here are the facts:

:- dynamic(loc_list/2).

I think this should be

:- dynamic loc_list/2.

!snip!

can_take(Thing) :-
(not(Thing = door)), % Error occurs here!

I can guess what not does, and I think the standard way to write it is

\+ Thing = door,

or probably even better,

Thing \= door,

!snip!

I can't really help with your other problems. But just from looking at
the names chosen, I can guess that your problem domain is an adventure
game. Are you aware of

http://www.ainewsletter.com/downloads/if_docs/

?
--
Darren Bane

.