|
 Re: SWI-Prolog digest, Vol 1 #518 - 12 msgs
Did you try to put dot after the f predicate?: you have f(integer, integer) it should be f(integer, integer).On Wed, Oct 28, 2009 at 9:21 PM, <swi-prolog-request@...> wrote:
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Today's Topics:
1. Newbie: common Syntax error: Operator expected (Vladimir Mihailenko)
2. Re: Newbie: common Syntax error: Operator expected (Uwe Lesta)
3. Re: Newbie: common Syntax error: Operator expected (Paulo Moura)
4. Re: Newbie: common Syntax error: Operator expected (jeffrose@...)
5. Re: Newbie: common Syntax error: Operator expected (Vladimir Mihailenko)
6. Re: Newbie: common Syntax error: Operator expected (Paulo Moura)
7. RE: Newbie: common Syntax error: Operator expected (Mihai Fonoage)
8. RE: Newbie: common Syntax error: Operator expected (Vladimir Mihailenko)
9. Re: Newbie: common Syntax error: Operator expected (Vladimir Mihailenko)
10. Re: Newbie: common Syntax error: Operator expected (Markus Triska)
11. Re: Newbie: common Syntax error: Operator expected (Paulo Moura)
12. RE: Newbie: common Syntax error: Operator expected (Mihai Fonoage)
--__--__--
Message: 1
Date: Wed, 28 Oct 2009 07:38:45 -0700 (PDT)
From: Vladimir Mihailenko <michailenko@...>
To: swi-prolog@...
Subject: [SWIPL] Newbie: common Syntax error: Operator expected
I have such code which is copy-pasted from book:
PREDICATES
f(integer, integer)
CLAUSES
f(X, 0) :- X<3, !.
f(X, 2) :- X>=3, X<6, !.
f(X, 4) :- X>=6.
When I try to run it in SWI-Prolog I get error:
1 ?- consult(q).
ERROR: c:/users/admin/documents/q.pl:2:4: Syntax error: Operator expected
% q compiled 0.00 sec, 1,136 bytes
true.
What should I fix to run under SWI-Prolog?
--
View this message in context: http://www.nabble.com/Newbie%3A-common-Syntax-error%3A-Operator-expected-tp26095829p26095829.html
Sent from the SWI Prolog mailing list archive at Nabble.com.
--__--__--
Message: 2
Date: Wed, 28 Oct 2009 16:07:47 +0100
From: Uwe Lesta <lesta@...>
To: Vladimir Mihailenko <michailenko@...>
Cc: swi-prolog@...
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Vladimir Mihailenko schrieb:
> I have such code which is copy-pasted from book:
>
> PREDICATES
> f(integer, integer)
> CLAUSES
> f(X, 0) :- X<3, !.
> f(X, 2) :- X>=3, X<6, !.
> f(X, 4) :- X>=6.
>
> When I try to run it in SWI-Prolog I get error:
>
> 1 ?- consult(q).
> ERROR: c:/users/admin/documents/q.pl:2:4: Syntax error: Operator expected
> % q compiled 0.00 sec, 1,136 bytes
> true.
>
> What should I fix to run under SWI-Prolog?
The code above is TURBO-PROLOG.
cut off the first three lines and try again
--
Kind regards
Uwe Lesta
--__--__--
Message: 3
From: Paulo Moura <pmoura@...>
To: SWI-Prolog mailinglist <swi-prolog@...>
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Date: Wed, 28 Oct 2009 15:09:09 +0000
On 2009/10/28, at 14:38, Vladimir Mihailenko wrote:
> I have such code which is copy-pasted from book:
>
> PREDICATES
> f(integer, integer)
> CLAUSES
> f(X, 0) :- X<3, !.
> f(X, 2) :- X>=3D3, X<6, !.
> f(X, 4) :- X>=3D6.
>
> When I try to run it in SWI-Prolog I get error:
>
> 1 ?- consult(q).
> ERROR: c:/users/admin/documents/q.pl:2:4: Syntax error: Operator =20
> expected
> % q compiled 0.00 sec, 1,136 bytes
> true.
>
> What should I fix to run under SWI-Prolog?
> --=20
The code seems to be written for VisualProlog, which, despite its name =20=
and being a fine language, is not Prolog as me and others understand =20
it. To compile the code above remove the lines in all-caps.
Cheers,
Paulo
-----------------------------------------------------------------
Paulo Jorge Lopes de Moura, PhD
Assistant Professor
Dep. of Computer Science, University of Beira Interior
6201-001 Covilh=E3, Portugal
Office 3.18 Ext. 3276
Phone: +351 275319891 Fax: +351 275319899
Email: <mailto:pmoura@...>
Home page: <http://www.di.ubi.pt/~pmoura>
Research: <http://logtalk.org/> Blog: <http://blog.logtalk.org/>
-----------------------------------------------------------------
--__--__--
Message: 4
To: michailenko@..., swi-prolog@...
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Date: Wed, 28 Oct 2009 11:19:48 -0400
From: jeffrose@...
----------MB_8CC25F93919D2E3_59C4_7378_webmail-m009.sysops.aol.com
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="us-ascii"
Vladimir:
'%' is commentary. This program would have compiled, if you supplied a ful=
l-stop after the fact 'f(integer, integer)', though the value of that fact=
in this case is unclear. Prolog is a typeless language. There is no need=
to declare an argument's type before using it, as is generally required=
in other strongly-typed languages.
% PREDICATES
% f(integer, integer)
% CLAUSES
f(X, 0) :- X<3, !.
f(X, 2) :- X>=3D3, X<6, !.
f(X, 4) :- X>=3D6.
?- between(1,10, X), f(X,Y).
X =3D 1,
Y =3D 0 ;
X =3D 2,
Y =3D 0 ;
X =3D 3,
Y =3D 2 ;
X =3D 4,
Y =3D 2 ;
X =3D 5,
Y =3D 2 ;
X =3D 6,
Y =3D 4 ;
X =3D 7,
Y =3D 4 ;
X =3D 8,
Y =3D 4 ;
X =3D 9,
Y =3D 4 ;
X =3D 10,
Y =3D 4.
?-=20
=20
=20
-----Original Message-----
From: Vladimir Mihailenko <michailenko@...>
To: swi-prolog@...
Sent: Wed, Oct 28, 2009 10:38 am
Subject: [SWIPL] Newbie: common Syntax error: Operator expected
I have such code which is copy-pasted from book:
PREDICATES
f(integer, integer)
CLAUSES
f(X, 0) :- X<3, !.
f(X, 2) :- X>=3D3, X<6, !.
f(X, 4) :- X>=3D6.
When I try to run it in SWI-Prolog I get error:
1 ?- consult(q).
ERROR: c:/users/admin/documents/q.pl:2:4: Syntax error: Operator expected
% q compiled 0.00 sec, 1,136 bytes
true.
What should I fix to run under SWI-Prolog?
--=20
View this message in context: http://www.nabble.com/Newbie%3A-common-Synta=
x-error%3A-Operator-expected-tp26095829p26095829.html
Sent from the SWI Prolog mailing list archive at Nabble.com.
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=20
=3D
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Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset="us-ascii"
<font color=3D'black' size=3D'2' face=3D'arial'>
<div> <font size=3D"2"><font face=3D"Arial, Helvetica, sans-serif">Vladimi=
r:<br>
<br>
'%' is commentary. This program would have compiled, if you supplied a ful=
l-stop after the fact 'f(integer, integer)', though the value of that fact=
in this case is unclear. Prolog is a typeless language. There is no need=
to declare an argument's type before using it, as is generally required=
in other strongly-typed languages.<br>
<br>
% PREDICATES<br>
% f(integer, integer)<br>
% CLAUSES<br>
f(X, 0) :- X<3, !.<br>
f(X, 2) :- X>=3D3, X<6, !.<br>
f(X, 4) :- X>=3D6.<br>
<br>
?- between(1,10, X), f(X,Y).<br>
X =3D 1,<br>
Y =3D 0 ;<br>
X =3D 2,<br>
Y =3D 0 ;<br>
X =3D 3,<br>
Y =3D 2 ;<br>
X =3D 4,<br>
Y =3D 2 ;<br>
X =3D 5,<br>
Y =3D 2 ;<br>
X =3D 6,<br>
Y =3D 4 ;<br>
X =3D 7,<br>
Y =3D 4 ;<br>
X =3D 8,<br>
Y =3D 4 ;<br>
X =3D 9,<br>
Y =3D 4 ;<br>
X =3D 10,<br>
Y =3D 4.<br>
<br>
?- <br>
<br>
</font></font></div>
<div> <br>
</div>
<div> <br>
</div>
-----Original Message-----<br>
From: Vladimir Mihailenko <%3Bmichailenko@...><br>
To: swi-prolog@...<br>
Sent: Wed, Oct 28, 2009 10:38 am<br>
Subject: [SWIPL] Newbie: common Syntax error: Operator expected<br>
<br>
<div id=3D"AOLMsgPart_0_f49d5edf-6897-4735-a352-5f9ed4bdac11" style=3D"mar=
gin: 0px; font-family: Tahoma,Verdana,Arial,Sans-Serif; font-size: 12px;=
color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">
<pre style=3D"font-size: 9pt;"><tt><br>
I have such code which is copy-pasted from book:<br>
<br>
PREDICATES<br>
f(integer, integer)<br>
CLAUSES<br>
f(X, 0) :- X<3, !.<br>
f(X, 2) :- X>=3D3, X<6, !.<br>
f(X, 4) :- X>=3D6.<br>
<br>
When I try to run it in SWI-Prolog I get error:<br>
<br>
1 ?- consult(q).<br>
ERROR: c:/users/admin/documents/q.pl:2:4: Syntax error: Operator expected<=
br>
% q compiled 0.00 sec, 1,136 bytes<br>
true.<br>
<br>
What should I fix to run under SWI-Prolog?<br>
-- <br>
View this message in context: <a __removedlink__357626844__href=3D"http://=
www.nabble.com/Newbie%3A-common-Syntax-error%3A-Operator-expected-tp260958=
29p26095829.html" target=3D"_blank">http://www.nabble.com/Newbie%3A-common=
-Syntax-error%3A-Operator-expected-tp26095829p26095829.html</a><br>
Sent from the SWI Prolog mailing list archive at Nabble.com.<br>
<br>
_______________________________________________<br>
SWI-Prolog mailing list<br>
<a __removedlink__357626844__href=3D"mailto:SWI-Prolog@...">SW=
I-Prolog@...</a><br>
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an/listinfo.cgi/swi-prolog" target=3D"_blank">https://mailbox.iai.uni-bonn=
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</tt></pre>
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</font>
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--__--__--
Message: 5
Date: Wed, 28 Oct 2009 08:38:10 -0700 (PDT)
From: Vladimir Mihailenko <michailenko@...>
To: swi-prolog@...
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Thank you. I used PREDICATES and CLAUSES, because SWI-Prolog IDE properly
highlights it like keywords. Can u say what is wrong with this code:
min(X, Y, X) :- X <= Y.
min(X, Y, Y) :- Y < X.
ERROR: c:/users/admin/documents/q.pl:1:0: Syntax error: Operator expected
% q compiled 0.00 sec, 824 bytes
true.
--
View this message in context: http://www.nabble.com/Newbie%3A-common-Syntax-error%3A-Operator-expected-tp26095829p26096831.html
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--__--__--
Message: 6
From: Paulo Moura <pmoura@...>
To: SWI-Prolog mailinglist <swi-prolog@...>
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Date: Wed, 28 Oct 2009 15:57:51 +0000
On 2009/10/28, at 15:38, Vladimir Mihailenko wrote:
> Can u say what is wrong with this code:
>
> min(X, Y, X) :- X <=3D Y.
> min(X, Y, Y) :- Y < X.
>
> ERROR: c:/users/admin/documents/q.pl:1:0: Syntax error: Operator =20
> expected
Change X <=3D Y to X =3D< Y.
Cheers,
Paulo
-----------------------------------------------------------------
Paulo Jorge Lopes de Moura, PhD
Assistant Professor
Dep. of Computer Science, University of Beira Interior
6201-001 Covilh=E3, Portugal
Office 3.18 Ext. 3276
Phone: +351 275319891 Fax: +351 275319899
Email: <mailto:pmoura@...>
Home page: <http://www.di.ubi.pt/~pmoura>
Research: <http://logtalk.org/> Blog: <http://blog.logtalk.org/>
-----------------------------------------------------------------
--__--__--
Message: 7
From: "Mihai Fonoage" <mfonoage@...>
To: "'Vladimir Mihailenko'" <michailenko@...>,
<swi-prolog@...>
Subject: RE: [SWIPL] Newbie: common Syntax error: Operator expected
Date: Wed, 28 Oct 2009 11:59:43 -0400
It should be X =< Y.
Mihai Fonoage
-----Original Message-----
From: swi-prolog-admin@...
[mailto:swi-prolog-admin@...] On Behalf Of Vladimir Mihailenko
Sent: Wednesday, October 28, 2009 11:38 AM
To: swi-prolog@...
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Thank you. I used PREDICATES and CLAUSES, because SWI-Prolog IDE properly
highlights it like keywords. Can u say what is wrong with this code:
min(X, Y, X) :- X <= Y.
min(X, Y, Y) :- Y < X.
ERROR: c:/users/admin/documents/q.pl:1:0: Syntax error: Operator expected
% q compiled 0.00 sec, 824 bytes
true.
--
View this message in context:
http://www.nabble.com/Newbie%3A-common-Syntax-error%3A-Operator-expected-tp2
6095829p26096831.html
Sent from the SWI Prolog mailing list archive at Nabble.com.
_______________________________________________
SWI-Prolog mailing list
SWI-Prolog@...
https://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog
--__--__--
Message: 8
Date: Wed, 28 Oct 2009 09:59:16 -0700 (PDT)
From: Vladimir Mihailenko <michailenko@...>
To: swi-prolog@...
Subject: RE: [SWIPL] Newbie: common Syntax error: Operator expected
Ooh... Its going to be infinitely... I just copy/paste examples and get the
same error message (writing first post I thought that the reason is the
same, but now...):
conc([], L, L).
conc([H|T], L, [H|T1]):=E2=80=93conc(T,L,T1).
Same error message:
6 ?- consult(q).
ERROR: c:/users/admin/documents/q.pl:2:0: Syntax error: Operator expected
% q compiled 0.00 sec, 0 bytes
true.
Can you recomend some resources which explores SWI-Prolog syntax or provide=
s
some simple but working examples...
Mihai Fonoage wrote:
>=20
> It should be X =3D< Y.=20
>=20
> Mihai Fonoage
>=20
> -----Original Message-----
> From: swi-prolog-admin@...
> [mailto:swi-prolog-admin@...] On Behalf Of Vladimir Mihailenk=
o
> Sent: Wednesday, October 28, 2009 11:38 AM
> To: swi-prolog@...
> Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
>=20
>=20
> Thank you. I used PREDICATES and CLAUSES, because SWI-Prolog IDE properly
> highlights it like keywords. Can u say what is wrong with this code:
>=20
> min(X, Y, X) :- X <=3D Y.
> min(X, Y, Y) :- Y < X.
>=20
> ERROR: c:/users/admin/documents/q.pl:1:0: Syntax error: Operator expected
> % q compiled 0.00 sec, 824 bytes
> true.
> --=20
> View this message in context:
> http://www.nabble.com/Newbie%3A-common-Syntax-error%3A-Operator-expected-=
tp2
> 6095829p26096831.html
> Sent from the SWI Prolog mailing list archive at Nabble.com.
>=20
> _______________________________________________
> SWI-Prolog mailing list
> SWI-Prolog@...
> https://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog
>=20
> _______________________________________________
> SWI-Prolog mailing list
> SWI-Prolog@...
> https://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog
>=20
>=20
--=20
View this message in context: http://www.nabble.com/Newbie%3A-common-Syntax=
-error%3A-Operator-expected-tp26095829p26098255.html
Sent from the SWI Prolog mailing list archive at Nabble.com.
--__--__--
Message: 9
Date: Wed, 28 Oct 2009 09:12:20 -0700 (PDT)
From: Vladimir Mihailenko <michailenko@...>
To: swi-prolog@...
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Ooh... Its going to be infinitely... I just copy/paste examples and get the
same error message (writing first post I thought that the reason is the
same, but now...):
conc([], L, L).
conc([H|T], L, [H|T1]):=E2=80=93conc(T,L,T1).
Same error message:
6 ?- consult(q).
ERROR: c:/users/admin/documents/q.pl:2:0: Syntax error: Operator expected
% q compiled 0.00 sec, 0 bytes
true.
Can you recomend some resources which explores SWI-Prolog syntax or provide=
s
some simple but working examples...
Paulo Moura wrote:
>=20
>=20
> On 2009/10/28, at 15:38, Vladimir Mihailenko wrote:
>=20
>> Can u say what is wrong with this code:
>>
>> min(X, Y, X) :- X <=3D Y.
>> min(X, Y, Y) :- Y < X.
>>
>> ERROR: c:/users/admin/documents/q.pl:1:0: Syntax error: Operator =20
>> expected
>=20
>=20
> Change X <=3D Y to X =3D< Y.
>=20
> Cheers,
>=20
> Paulo
>=20
>=20
> -----------------------------------------------------------------
> Paulo Jorge Lopes de Moura, PhD
> Assistant Professor
> Dep. of Computer Science, University of Beira Interior
> 6201-001 Covilh=C3=A3, Portugal
>=20
> Office 3.18 Ext. 3276
> Phone: +351 275319891 Fax: +351 275319899
> Email: <mailto:pmoura@...>
>=20
> Home page: <http://www.di.ubi.pt/~pmoura>
> Research: <http://logtalk.org/> Blog: <http://blog.logtalk.org/>
> -----------------------------------------------------------------
>=20
>=20
>=20
>=20
>=20
>=20
>=20
> _______________________________________________
> SWI-Prolog mailing list
> SWI-Prolog@...
> https://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog
>=20
>=20
--=20
View this message in context: http://www.nabble.com/Newbie%3A-common-Syntax=
-error%3A-Operator-expected-tp26095829p26097523.html
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--__--__--
Message: 10
From: Markus Triska <markus.triska@...>
To: Vladimir Mihailenko <michailenko@...>
Cc: swi-prolog@...
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Date: Wed, 28 Oct 2009 19:59:23 +0100
Vladimir Mihailenko <michailenko@...> writes:
> conc([H|T], L, [H|T1]):=E2=80=93conc(T,L,T1).
The character following ":" is Unicode's EN DASH (U+2013). You should
instead use the character "-" (Unicode's HYPHEN-MINUS, U+002D) there.
--__--__--
Message: 11
From: Paulo Moura <pmoura@...>
To: SWI-Prolog mailinglist <swi-prolog@...>
Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
Date: Wed, 28 Oct 2009 19:07:24 +0000
On 2009/10/28, at 16:12, Vladimir Mihailenko wrote:
> Can you recomend some resources which explores SWI-Prolog syntax or =20=
> provides
> some simple but working examples...
Check the comp.lang.prolog FAQ:
http://www.logic.at/prolog/faq/
More links to learning resources here:
http://logtalk.org/links.html
Happy learning :-) Cheers,
Paulo
-----------------------------------------------------------------
Paulo Jorge Lopes de Moura, PhD
Assistant Professor
Dep. of Computer Science, University of Beira Interior
6201-001 Covilh=E3, Portugal
Office 3.18 Ext. 3276
Phone: +351 275319891 Fax: +351 275319899
Email: <mailto:pmoura@...>
Home page: <http://www.di.ubi.pt/~pmoura>
Research: <http://logtalk.org/> Blog: <http://blog.logtalk.org/>
-----------------------------------------------------------------
--__--__--
Message: 12
From: "Mihai Fonoage" <mfonoage@...>
To: "'Vladimir Mihailenko'" <michailenko@...>,
<swi-prolog@...>
Subject: RE: [SWIPL] Newbie: common Syntax error: Operator expected
Date: Wed, 28 Oct 2009 15:01:43 -0400
>Ooh... Its going to be infinitely... I just copy/paste examples and get the
>same error message (writing first post I thought that the reason is the
>same, but now...):
>
>conc([], L, L).
>conc([H|T], L, [H|T1]):-conc(T,L,T1).
>
>Same error message:
>
>6 ?- consult(q).
>ERROR: c:/users/admin/documents/q.pl:2:0: Syntax error: Operator expected
>% q compiled 0.00 sec, 0 bytes
>true.
Change ":-" with ":-". The dash in your example is the problem (it seems a
little longer than the default one).
>Can you recomend some resources which explores SWI-Prolog syntax or
>provides
>some simple but working examples...
I would recommend going to http://www.swi-prolog.org/ and reading the
manual.
Sincerely,
Mihai Fonoage
Mihai Fonoage wrote:
>
> It should be X =< Y.
>
> Mihai Fonoage
>
> -----Original Message-----
> From: swi-prolog-admin@...
> [mailto:swi-prolog-admin@...] On Behalf Of Vladimir Mihailenko
> Sent: Wednesday, October 28, 2009 11:38 AM
> To: swi-prolog@...
> Subject: Re: [SWIPL] Newbie: common Syntax error: Operator expected
>
>
> Thank you. I used PREDICATES and CLAUSES, because SWI-Prolog IDE properly
> highlights it like keywords. Can u say what is wrong with this code:
>
> min(X, Y, X) :- X <= Y.
> min(X, Y, Y) :- Y < X.
>
> ERROR: c:/users/admin/documents/q.pl:1:0: Syntax error: Operator expected
> % q compiled 0.00 sec, 824 bytes
> true.
> --
> View this message in context:
>
http://www.nabble.com/Newbie%3A-common-Syntax-error%3A-Operator-expected-tp2
> 6095829p26096831.html
> Sent from the SWI Prolog mailing list archive at Nabble.com.
>
> _______________________________________________
> SWI-Prolog mailing list
> SWI-Prolog@...
> https://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog
>
> _______________________________________________
> SWI-Prolog mailing list
> SWI-Prolog@...
> https://mailbox.iai.uni-bonn.de/mailman/listinfo.cgi/swi-prolog
>
>
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-- Best Regards Levan Cheishvili
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