MESSAGE
| DATE | 2016-04-26 |
| FROM | Christopher League
|
| SUBJECT | Re: [Hangout-NYLXS] error: unclosed character literal
|
From hangout-bounces-at-nylxs.com Wed Apr 27 00:08:02 2016
Return-Path:
X-Original-To: archive-at-mrbrklyn.com
Delivered-To: archive-at-mrbrklyn.com
Received: from www.mrbrklyn.com (www.mrbrklyn.com [96.57.23.82])
by mrbrklyn.com (Postfix) with ESMTP id 87403163D45;
Wed, 27 Apr 2016 00:08:01 -0400 (EDT)
X-Original-To: hangout-at-nylxs.com
Delivered-To: hangout-at-nylxs.com
Received: by mrbrklyn.com (Postfix, from userid 1000)
id 03442162A0A; Wed, 27 Apr 2016 00:07:56 -0400 (EDT)
Resent-From: Ruben Safir
Resent-Date: Wed, 27 Apr 2016 00:07:56 -0400
Resent-Message-ID: <20160427040756.GD1115-at-www.mrbrklyn.com>
Resent-To: hangout-at-nylxs.com
X-Original-To: ruben-at-mrbrklyn.com
Delivered-To: ruben-at-mrbrklyn.com
Received: from B-EXH-EDGE1.liunet.edu (b-edge1.smtp.liu.edu [148.4.248.206])
by mrbrklyn.com (Postfix) with ESMTP id F277C161224
for ; Tue, 26 Apr 2016 09:48:51 -0400 (EDT)
Received: from B-EXH-3.liunet.edu (148.4.250.212) by B-EXH-EDGE1.liunet.edu
(148.4.248.206) with Microsoft SMTP Server (TLS) id 14.3.210.2; Tue, 26 Apr
2016 09:48:44 -0400
Received: from localhost (96.250.202.133) by B-EXH-3.liunet.edu
(148.4.250.212) with Microsoft SMTP Server (TLS) id 15.0.1156.6; Tue, 26 Apr
2016 09:48:49 -0400
From: Christopher League
To: Ruben Safir , Hangout
In-Reply-To: <571F0BCB.2050007-at-mrbrklyn.com>
References: <571F0BCB.2050007-at-mrbrklyn.com>
User-Agent: Notmuch/0.21 (http://notmuchmail.org) Emacs/24.5.1
(x86_64-unknown-linux-gnu)
Date: Tue, 26 Apr 2016 09:48:46 -0400
Message-ID: <87bn4wqy4h.fsf-at-lydrik.home.lan>
MIME-Version: 1.0
X-Originating-IP: [96.250.202.133]
X-ClientProxiedBy: U-EXH-CAS.liunet.edu (148.4.184.26) To B-EXH-3.liunet.edu
(148.4.250.212)
X-Content-Filtered-By: Mailman/MimeDel 2.1.17
Subject: Re: [Hangout-NYLXS] error: unclosed character literal
X-BeenThere: hangout-at-nylxs.com
X-Mailman-Version: 2.1.17
Precedence: list
Reply-To: NYLXS Discussions List
List-Id: NYLXS Discussions List
List-Unsubscribe: ,
List-Archive:
List-Post:
List-Help:
List-Subscribe: ,
Content-Type: multipart/mixed; boundary="===============1821118764=="
Errors-To: hangout-bounces-at-nylxs.com
Sender: "hangout"
--===============1821118764==
Content-Type: multipart/signed; boundary="===-=-="; micalg=pgp-sha256;
protocol="application/pgp-signature"
--===-=-=
Content-Type: multipart/alternative; boundary="==-=-="
--==-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Yeah, I think this is because the single quote only works for a single
character in C/Java so `'>=3D'` is not allowed. Assuming the type of `op`
is `String`, then you can do `op =3D=3D ">=3D"` or probably even better,
`op.equals(">=3D")`.
Comparing strings in Java with `=3D=3D` is not always reliable, because it
uses object (pointer) equality. If they are two different string
objects, they'll register as not-equal, even if they have the same
characters. Therefore, `op.equals(">=3D")` is recommended, because it
actually looks at the characters. (Just like in C, you use `strcmp`
instead of `=3D=3D` for the same reason.)
Another possibility that Java supports and C doesn't is that you can use
a string in a switch:
switch(op) {
case ">=3D":
case ">":
// etc.
break
}
and it compiles that to use `op.equals()` behind the scenes.
CL
Ruben Safir writes:
> TypeCheckingVisitor.java:61: error: unclosed character literal
> if(op =3D=3D '>' || op =3D=3D '<' || op =3D=3D '<=3D' ||=
op =3D=3D '>=3D' ){
>
>
> The editor also indicates a parsing problem in the Java but I am at a los=
s.
>
> '<' seems to work
>
>
> This is the code snippet
>
> //Comparison Operators
> =C2=A6if(op =3D=3D '>' || op =3D=3D '<' || op =3D=3D '<=3D' || op =
=3D=3D '>=3D' ){
> =C2=A6if( (leftType =3D=3D Type.INT && rightType =3D=3D Type.INT=
) || (leftType=3D=3D Type.FLOAT || rightType=3D=3D Type.FLOAT)|| (leftType =
=3D=3D Type.INT && rightType =3D=3D Type.FLOAT)|| (leftType =3D=3D Type.FLO=
AT && rightType =3D=3D Type.INT ) ){
> =C2=A6return trace(ctx, Type.BOOL);
> =C2=A6}
> =C2=A6 =C2=A6 =C2=A6return typeMismatch(ctx, leftType, rightType);
>
> =C2=A6}=20=20
>
> --=20
> So many immigrant groups have swept through our town
> that Brooklyn, like Atlantis, reaches mythological
> proportions in the mind of the world - RI Safir 1998
> http://www.mrbrklyn.com=20
>
> DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
> http://www.nylxs.com - Leadership Development in Free Software
> http://www2.mrbrklyn.com/resources - Unpublished Archive
> http://www.coinhangout.com - coins!
> http://www.brooklyn-living.com
>
> Being so tracked is for FARM ANIMALS and and extermination camps,
> but incompatible with living as a free human being. -RI Safir 2013
--==-=-=
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Yeah, I think this is because the single quote only works for a single
character in C/Java so '>=' is not allowed. Assuming the type of op is
String, then you can do op == ">=" or probably even better,
op.equals(">=").
Comparing strings in Java with == is not always reliable, because it
uses object (pointer) equality. If they are two different string
objects, they'll register as not-equal, even if they have the same
characters. Therefore, op.equals(">=") is recommended, because it
actually looks at the characters. (Just like in C, you use strcmp
instead of == for the same reason.)
Another possibility that Java supports and C doesn't is that you can
use a string in a switch:
switch(op) {
case ">=":
case ">":
// etc.
break
}
and it compiles that to use op.equals() behind the scenes.
CL
Ruben Safir [1]ruben-at-mrbrklyn.com writes:
TypeCheckingVisitor.java:61: error: unclosed character literal if(op
== `>' || op == `<' || op == `<=' || op == `>=' ){
The editor also indicates a parsing problem in the Java but I am at
a loss.
`<' seems to work
This is the code snippet
//Comparison Operators ?if(op == `>' || op == `<' || op == `<=' ||
op == `>=' ){ ?if( (leftType == Type.INT && rightType == Type.INT)
|| (leftType== Type.FLOAT || rightType== Type.FLOAT)|| (leftType ==
Type.INT && rightType == Type.FLOAT)|| (leftType == Type.FLOAT &&
rightType == Type.INT ) ){ ?return trace(ctx, Type.BOOL); ?} ? ?
?return typeMismatch(ctx, leftType, rightType);
?}
- So many immigrant groups have swept through our town that
Brooklyn, like Atlantis, reaches mythological proportions in the
mind of the world - RI Safir 1998 http://www.mrbrklyn.com
DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
http://www2.mrbrklyn.com/resources - Unpublished Archive
http://www.coinhangout.com - coins! http://www.brooklyn-living.com
Being so tracked is for FARM ANIMALS and and extermination camps,
but incompatible with living as a free human being. -RI Safir 2013
References
1. mailto:ruben-at-mrbrklyn.com
--==-=-=--
--===-=-=
Content-Type: application/pgp-signature; name="signature.asc"
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
iQEcBAEBCAAGBQJXH3G+AAoJEGuLsz1PMbCLtZQH/iQElhic6tQ+LjVcq/BSMQLT
zVMDG/ddqhzZC2rx6m3pYv9FQ2wAEKW2q5nH0OoVqXRdo9dCIS+vr37FtIk9f+Ys
dGRJ6K0bDNvVAUiVB5poP3Rc/3ho4nJumP1+NUA+keKW5sj33jaUCxOdb4pN4cxk
6xG0E/xFtAQROehvrKkz+vQwlJCmqx6DSwfr6gwVdo0baEqK6mBThiyCMID+Zkez
ZMxMTV8pF/cqwoK1Q+eEx1Afjfrol8QLUpoY05Qnim0e3Q320YEGngJcLjkgURTP
bKRp8xCdH21+bEU9RdI6yAjlcqxa72V4isBqRAAPtp0/iYtuzgj+L1HMS3cU57E=
=huOO
-----END PGP SIGNATURE-----
--===-=-=--
--===============1821118764==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
hangout mailing list
hangout-at-nylxs.com
http://www.nylxs.com/
--===============1821118764==--
--===============1821118764==
Content-Type: multipart/signed; boundary="===-=-="; micalg=pgp-sha256;
protocol="application/pgp-signature"
--===-=-=
Content-Type: multipart/alternative; boundary="==-=-="
--==-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Yeah, I think this is because the single quote only works for a single
character in C/Java so `'>=3D'` is not allowed. Assuming the type of `op`
is `String`, then you can do `op =3D=3D ">=3D"` or probably even better,
`op.equals(">=3D")`.
Comparing strings in Java with `=3D=3D` is not always reliable, because it
uses object (pointer) equality. If they are two different string
objects, they'll register as not-equal, even if they have the same
characters. Therefore, `op.equals(">=3D")` is recommended, because it
actually looks at the characters. (Just like in C, you use `strcmp`
instead of `=3D=3D` for the same reason.)
Another possibility that Java supports and C doesn't is that you can use
a string in a switch:
switch(op) {
case ">=3D":
case ">":
// etc.
break
}
and it compiles that to use `op.equals()` behind the scenes.
CL
Ruben Safir writes:
> TypeCheckingVisitor.java:61: error: unclosed character literal
> if(op =3D=3D '>' || op =3D=3D '<' || op =3D=3D '<=3D' ||=
op =3D=3D '>=3D' ){
>
>
> The editor also indicates a parsing problem in the Java but I am at a los=
s.
>
> '<' seems to work
>
>
> This is the code snippet
>
> //Comparison Operators
> =C2=A6if(op =3D=3D '>' || op =3D=3D '<' || op =3D=3D '<=3D' || op =
=3D=3D '>=3D' ){
> =C2=A6if( (leftType =3D=3D Type.INT && rightType =3D=3D Type.INT=
) || (leftType=3D=3D Type.FLOAT || rightType=3D=3D Type.FLOAT)|| (leftType =
=3D=3D Type.INT && rightType =3D=3D Type.FLOAT)|| (leftType =3D=3D Type.FLO=
AT && rightType =3D=3D Type.INT ) ){
> =C2=A6return trace(ctx, Type.BOOL);
> =C2=A6}
> =C2=A6 =C2=A6 =C2=A6return typeMismatch(ctx, leftType, rightType);
>
> =C2=A6}=20=20
>
> --=20
> So many immigrant groups have swept through our town
> that Brooklyn, like Atlantis, reaches mythological
> proportions in the mind of the world - RI Safir 1998
> http://www.mrbrklyn.com=20
>
> DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
> http://www.nylxs.com - Leadership Development in Free Software
> http://www2.mrbrklyn.com/resources - Unpublished Archive
> http://www.coinhangout.com - coins!
> http://www.brooklyn-living.com
>
> Being so tracked is for FARM ANIMALS and and extermination camps,
> but incompatible with living as a free human being. -RI Safir 2013
--==-=-=
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Yeah, I think this is because the single quote only works for a single
character in C/Java so '>=' is not allowed. Assuming the type of op is
String, then you can do op == ">=" or probably even better,
op.equals(">=").
Comparing strings in Java with == is not always reliable, because it
uses object (pointer) equality. If they are two different string
objects, they'll register as not-equal, even if they have the same
characters. Therefore, op.equals(">=") is recommended, because it
actually looks at the characters. (Just like in C, you use strcmp
instead of == for the same reason.)
Another possibility that Java supports and C doesn't is that you can
use a string in a switch:
switch(op) {
case ">=":
case ">":
// etc.
break
}
and it compiles that to use op.equals() behind the scenes.
CL
Ruben Safir [1]ruben-at-mrbrklyn.com writes:
TypeCheckingVisitor.java:61: error: unclosed character literal if(op
== `>' || op == `<' || op == `<=' || op == `>=' ){
The editor also indicates a parsing problem in the Java but I am at
a loss.
`<' seems to work
This is the code snippet
//Comparison Operators ?if(op == `>' || op == `<' || op == `<=' ||
op == `>=' ){ ?if( (leftType == Type.INT && rightType == Type.INT)
|| (leftType== Type.FLOAT || rightType== Type.FLOAT)|| (leftType ==
Type.INT && rightType == Type.FLOAT)|| (leftType == Type.FLOAT &&
rightType == Type.INT ) ){ ?return trace(ctx, Type.BOOL); ?} ? ?
?return typeMismatch(ctx, leftType, rightType);
?}
- So many immigrant groups have swept through our town that
Brooklyn, like Atlantis, reaches mythological proportions in the
mind of the world - RI Safir 1998 http://www.mrbrklyn.com
DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002
http://www.nylxs.com - Leadership Development in Free Software
http://www2.mrbrklyn.com/resources - Unpublished Archive
http://www.coinhangout.com - coins! http://www.brooklyn-living.com
Being so tracked is for FARM ANIMALS and and extermination camps,
but incompatible with living as a free human being. -RI Safir 2013
References
1. mailto:ruben-at-mrbrklyn.com
--==-=-=--
--===-=-=
Content-Type: application/pgp-signature; name="signature.asc"
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
iQEcBAEBCAAGBQJXH3G+AAoJEGuLsz1PMbCLtZQH/iQElhic6tQ+LjVcq/BSMQLT
zVMDG/ddqhzZC2rx6m3pYv9FQ2wAEKW2q5nH0OoVqXRdo9dCIS+vr37FtIk9f+Ys
dGRJ6K0bDNvVAUiVB5poP3Rc/3ho4nJumP1+NUA+keKW5sj33jaUCxOdb4pN4cxk
6xG0E/xFtAQROehvrKkz+vQwlJCmqx6DSwfr6gwVdo0baEqK6mBThiyCMID+Zkez
ZMxMTV8pF/cqwoK1Q+eEx1Afjfrol8QLUpoY05Qnim0e3Q320YEGngJcLjkgURTP
bKRp8xCdH21+bEU9RdI6yAjlcqxa72V4isBqRAAPtp0/iYtuzgj+L1HMS3cU57E=
=huOO
-----END PGP SIGNATURE-----
--===-=-=--
--===============1821118764==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
hangout mailing list
hangout-at-nylxs.com
http://www.nylxs.com/
--===============1821118764==--
|
|
