A bug

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Article #2580

#2580

From: jim
Date: Fri, 13 Feb 1987 13:07

26 lines
1485 bytes

A bug: '1.2' is not an integer in our prolog, so X is '1.2' + '3.4'
gives an error message. Doing 
?- name('1.2',Ascii),name(Integer,Ascii), integer(Integer).
also fails. So, how do I take the single brackets off?

Another thing, why does 'name' on the empty list of ascii characters give an
atom with no name rather than a fail. On our cprolog
?-name(X,[])
gives X= '' like so (including the space in front) and creating a Y thus
?-name(X,[]),Y =[X|[]]
gives Y=[ '']

which at least is unrecognisable, while a development prolog I've used gives
Y=[] since no quote marks go around the invisible atom. note that Y will not
unify with the empty list (boy was that a bug to find!)

ta, jim

-- 
Jim Scobbie:    Centre for Cognitive Science, Edinburgh University,
                2 Buccleuch Place, Edinburgh, EH8 9LW, SCOTLAND

UUCP:	 ...!ukc!cstvax!epistemi!jim
JANET:	 jim@uk.ac.ed.epistemi

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watnot!watmath!clyde!rutgers!brl-adm!seismo!mcvax!ukc!its63b!epistemi!jim
From: jim@epistemi.UUCP
Newsgroups: comp.lang.prolog
Subject: A bug
Message-ID: <1739@epistemi.UUCP>
Date: Fri, 13-Feb-87 08:07:04 EST
Article-I.D.: epistemi.1739
Posted: Fri Feb 13 08:07:04 1987
Date-Received: Sun, 15-Feb-87 05:31:32 EST
Reply-To: jim@epistemi.UUCP (Jim Scobbie)
Distribution: comp.lang.prolog
Organization: Epistemics, Edinburgh U., Scotland
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