Groups | Search | Server Info | Keyboard shortcuts | Login | Register
Groups > comp.lang.java.programmer > #3686
| From | markspace <-@.> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: boolean to int : was char to decimal |
| Date | 2011-05-06 07:07 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <iq0vat$ip6$1@dont-email.me> (permalink) |
| References | <92ea64F3avU1@mid.individual.net> <Xns9EDBB8224D5B6vaj4088ianshef@138.125.254.103> <iptlkq$62g$2@lust.ihug.co.nz> <iq0r9c$efs$1@dont-email.me> |
On 5/6/2011 6:00 AM, Jeff Higgins wrote:
> C++ test:
> int test = (int(d2 > e) << 1) + int(d3 > e);
>
> Java test:
> int t = d2 > e ? 1<<1 : 0;
^^^^
Well, this is a 2. The Java coding conventions say to declare this as a
constant, I'm not sure that is valuable here though
> int test = d3 > e ? t+1 : t;
t += d3 > e ? 1 : 0;
The whole thing could be done in one go, of course:
int test = ((d2 > e) ? 2 : 0) + ((d3 > e) ? 1 : 0);
>
> switch(test)
> { case(0):
> case(1):
> case(2):
> case(3):
> }
Blech. So the whole point here seems to be to set the 1 bit if d2 > e,
and set the 0 bit if d2 > e. Why not just do that?
if( d2 > e ) {
if( d3 > e ) {
// case 0
} else {
// case 1
}
} else {
if( d3 > e ) {
// case 2
} else {
// case 3
}
}
I don't think there's more tests for the CPU in this case. In fact the
jump to implement the switch might be more expensive that just a simple
branch test. I'd have to know what is motivating the use of switch
instead of if-else.
Overall, I feel the last one, the if-else in Java, is the most clear and
maintainable. Given your apparent confusing trying to translate the C++
version literally, I think I'd say that promoting booleans to ints is a
bad idea, as it produces crap.
Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar
char to decimal Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-05-05 01:43 +0100
Re: char to decimal Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2011-05-04 17:49 -0700
Re: char to decimal Ian Shef <invalid@avoiding.spam> - 2011-05-05 01:06 +0000
Re: char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-05 20:03 +1200
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-05 07:03 -0400
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-05 11:18 +0000
Re: char to decimal Patricia Shanahan <pats@acm.org> - 2011-05-05 06:11 -0700
Re: char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-06 01:59 +1200
Re: char to decimal Mayeul <mayeul.marguet@free.fr> - 2011-05-05 16:53 +0200
Re: char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-06 11:49 +1200
Re: char to decimal Mayeul <mayeul.marguet@free.fr> - 2011-05-06 08:46 +0200
Re: char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-06 18:43 +1200
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 06:52 -0400
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-06 11:39 +0000
Re: char to decimal Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-05-05 14:13 -0400
Re: char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-06 11:49 +1200
Re: char to decimal Mayeul <mayeul.marguet@free.fr> - 2011-05-06 08:47 +0200
Re: char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-06 18:43 +1200
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 06:54 -0400
Re: char to decimal Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2011-05-06 10:30 +0300
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-05 17:05 -0400
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-05 14:56 +0000
Re: char to decimal Paul Cager <paul.cager@googlemail.com> - 2011-05-05 11:48 -0700
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-05 17:06 -0400
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-05 21:28 +0000
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-05 17:32 -0400
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-06 08:31 +0000
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-05 17:04 -0400
boolean to int : was char to decimal Jeff Higgins <jeff@invalid.invalid> - 2011-05-06 09:00 -0400
Re: boolean to int : was char to decimal Patricia Shanahan <pats@acm.org> - 2011-05-06 06:54 -0700
Re: boolean to int : was char to decimal markspace <-@.> - 2011-05-06 07:07 -0700
Re: boolean to int : was char to decimal markspace <-@.> - 2011-05-06 08:30 -0700
Re: boolean to int : was char to decimal Nigel Wade <nmw-news@ion.le.ac.uk> - 2011-05-06 15:35 +0100
Re: boolean to int : was char to decimal Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-05-06 19:12 +0200
Re: boolean to int : was char to decimal Jeff Higgins <jeff@invalid.invalid> - 2011-05-06 13:26 -0400
Re: boolean to int : was char to decimal Jeff Higgins <jeff@invalid.invalid> - 2011-05-06 21:25 -0400
Re: boolean to int : was char to decimal Jeff Higgins <jeff@invalid.invalid> - 2011-05-06 21:28 -0400
Re: boolean to int : was char to decimal Michael Wojcik <mwojcik@newsguy.com> - 2011-05-09 12:51 -0400
Re: boolean to int : was char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-09 23:54 +0000
Re: boolean to int : was char to decimal Jeff Higgins <jeff@invalid.invalid> - 2011-05-09 20:51 -0400
Re: boolean to int : was char to decimal Michael Wojcik <mwojcik@newsguy.com> - 2011-05-10 11:20 -0400
Re: boolean to int : was char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-10 13:47 +1200
Re: boolean to int : was char to decimal Michael Wojcik <mwojcik@newsguy.com> - 2011-05-10 11:02 -0400
Re: boolean to int : was char to decimal Lawrence D'Oliveiro <ldo@geek-central.gen.new_zealand> - 2011-05-11 14:05 +1200
Re: boolean to int : was char to decimal Jeff Higgins <jeff@invalid.invalid> - 2011-05-11 08:11 -0400
Re: char to decimal Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-05-05 02:12 +0100
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-04 21:59 -0400
Re: char to decimal Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-05-05 16:14 +0100
Re: char to decimal markspace <-@.> - 2011-05-05 11:20 -0700
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-05 17:10 -0400
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-05 22:00 +0000
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-05 18:20 -0400
Re: char to decimal Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-05-06 10:45 +0100
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 06:56 -0400
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-06 11:48 +0000
Re: char to decimal Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-05-06 08:38 -0400
Re: char to decimal Michael Wojcik <mwojcik@newsguy.com> - 2011-05-06 09:47 -0400
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 12:02 -0400
Re: char to decimal Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-05-06 19:15 +0200
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 14:01 -0400
Re: char to decimal Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-05-06 20:07 +0200
Re: O/T linguistics (Was: char to decimal) Lew <noone@lewscanon.com> - 2011-05-06 15:28 -0400
Re: O/T linguistics Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2011-05-06 21:44 +0200
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-06 23:57 +0000
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 12:00 -0400
Re: char to decimal Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-05-06 18:29 +0100
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 14:02 -0400
Re: char to decimal Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-05-07 01:09 +0100
Re: char to decimal Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-05-07 00:18 +0000
Re: char to decimal Lew <noone@lewscanon.com> - 2011-05-06 21:30 -0400
Re: char to decimal Roedy Green <see_website@mindprod.com.invalid> - 2011-05-04 22:03 -0700
Re: char to decimal "Nasser M. Abbasi" <nma@12000.org> - 2011-05-05 01:14 -0700
Re: char to decimal Dirk Bruere at NeoPax <dirk.bruere@gmail.com> - 2011-05-05 16:15 +0100
csiph-web