[QUIZ] Quine (#207)

[Robert Dober]

I'd show you but the spoiler-free period hasn't expired yet

martin

Bummer I forgot that there is only one program of size 0, apologies


--=20
Toutes les grandes personnes ont d=92abord =E9t=E9 des enfants, mais peu
d=92entre elles s=92en souviennent.

All adults have been children first, but not many remember.

[Antoine de Saint-Exup=E9ry]

 

[Pascal J. Bourguignon]

Ok, the shortest solution did not have much success, what about a long
one then

http://pastie.org/495692

$ echo ----- ; cat quine.rb ; echo ----- ; ruby quine.rb ; echo -----

 

[Robert Dober]

$ echo ----- ; cat quine.rb ; echo ----- ; ruby quine.rb ; echo -----

Seems you managed without parens



--=20
Toutes les grandes personnes ont d=92abord =E9t=E9 des enfants, mais peu
d=92entre elles s=92en souviennent.

All adults have been children first, but not many remember.

[Antoine de Saint-Exup=E9ry]

 

[Bill Kelly]

I have 30 characters, w/out cheating. It does output a warning
on 1.8.6, but not 1.8.7 or 1.9.1. (And since the warning is on
stderr, it doesn't affect the quine output really, I guess.)

Here 'tis. It's 29 characters plus a linefeed.

p eval _="print'p eval _=';_"


Regards,

Bill

 

[Heesob Park]

$ echo ----- ; cat quine.rb ; echo ----- ; ruby quine.rb ; echo -----

Here is a variant version of the above:

puts (_="puts (_=%c%s%c)%%[34,_,34]")%[34,_,34]


Regards,
Park Heesob

 

[Aureliano Calvo]

[Note: parts of this message were removed to make it a legal post.]

I did something like that, but with parenthesis.

s="s=%c%s%c;printf(s,34,s,34)";printf(s,34,s,34)

It is based on the C quine that uses printf on the wikipedia page.

 

[Aureliano Calvo]

[Note: parts of this message were removed to make it a legal post.]

And I did one with a carriage return:

s="s=%c%s%c;printf(s,34,s,34,13,10)%c%c";printf(s,34,s,34,13,10)


A little longer but looks nicer

 

[Jorrel]

[Note: parts of this message were removed to make it a legal post.]

Is using File considered cheating?

puts File.readlines __FILE__

And I did one with a carriage return:

s="s=%c%s%c;printf(s,34,s,34,13,10)%c%c";printf(s,34,s,34,13,10)


A little longer but looks nicer

 

[Matthew Williams]

Version 1: The "pretty" one with 'end's

require 'rubygems'
require 'ruby2ruby'

class Quine < Object
def initialize
puts "require 'rubygems'\nrequire 'ruby2ruby'\n#{Ruby2Ruby.translate
self.class}\nQuine.new\n"
end
end
Quine.new


Version two, much less maintainable:

a="a=%p;puts a%%a";puts a%a

Version 3, cheating (unix only):

puts `cat #{$0}`

 

[Martin DeMello]

Version 3, cheating (unix only):

puts `cat #{$0}`

here's my extremely cheating 10-byte version:

# sudo ln -s /bin/cat /usr/local/bin/c
# echo | ruby -p q.rb
$_=`c #$0`

martin

 

[Joshua Ballanco]

here's my extremely cheating 10-byte version:

# sudo ln -s /bin/cat /usr/local/bin/c
# echo | ruby -p q.rb
$_=`c #$0`

martin

That was essentially my original cheat, then my friend pointed out
this simple modification to get to 8 bytes:

cat a $><<`a`

ruby a $><<`a`

which a /usr/local/bin/a

cat `which a`

#!/usr/bin/env ruby
puts '$><<`a`'


- Josh

 

[Sebastian Hungerecker]

Am Montag 01 Juni 2009 06:30:16 schrieb Matthew Williams:

puts `cat #{$0}`

The problem with that is that it won't work when the file name contains spaces
or shell meta-characters. This will however:
system"cat",$0

 

[James Gray]

Is using File considered cheating?

puts File.readlines __FILE__

It usually is, yes. Your version can be shortened though:

puts File.read __FILE__

You can also do it more creatively, if a bit longer:

DATA.rewind
puts DATA.read
__END__

James Edward Gray II

 

[Brian Candler]

It usually is, yes.

I'd suggest you pipe the source code into the ruby interpreter:

cat quine.rb | ruby

cat quine.rb | ruby | diff -u quine.rb -

That eliminates tricks with __FILE__ and $0.

 

[Robert Dober]

I'd suggest you pipe the source code into the ruby interpreter:

=A0 =A0cat quine.rb | ruby

=A0 =A0cat quine.rb | ruby | diff -u quine.rb -

That eliminates tricks with __FILE__ and $0.

Good thinking, but the "optimal" solution still passes

xxx | ruby | diff -u xxx -

N.B. this ">" ain't a quote
Robert
--=20
Toutes les grandes personnes ont d=92abord =E9t=E9 des enfants, mais peu
d=92entre elles s=92en souviennent.

All adults have been children first, but not many remember.

[Antoine de Saint-Exup=E9ry]

 

[Brian Candler]

Good thinking, but the "optimal" solution still passes

Sure - the trivial quine is valid. I can also run it on my network which
has zero nodes.

 

[Pascal J. Bourguignon]

I'd suggest you pipe the source code into the ruby interpreter:

cat quine.rb | ruby

cat quine.rb | ruby | diff -u quine.rb -

That eliminates tricks with __FILE__ and $0.

A better solution would be to compile the ruby program. Then $0 would
be a binary file and that trick would fail.

 

[Robert Dober]

Sure - the trivial quine is valid. I can also run it on my network which
has zero nodes.

True but you cannot test it on your network with zero nodes, but I
have a network with zero nodes too, maybe we can come up with
something like Map Reduce ( or was that Collect Inject :-O)


--=20
Toutes les grandes personnes ont d=E2=80=99abord =C3=A9t=C3=A9 des enfants,=
mais peu
d=E2=80=99entre elles s=E2=80=99en souviennent.

All adults have been children first, but not many remember.

[Antoine de Saint-Exup=C3=A9ry]

 

[Siep Korteling]

A jaw dropping quine by Yusuke Endoh:
http://mamememo.blogspot.com/2010/09/qlobe.html

 

[Ryan Davis]

A jaw dropping quine by Yusuke Endoh:
http://mamememo.blogspot.com/2010/09/qlobe.html

Holy shit.

I am in awe.