Darren New <dne### [at] sanrrcom> wrote:
> Warp wrote:
> >   It's one of the best self-replicating programs I have ever seen.

> FWIW, this is called a "quine", after the philosopher Quine.

> http://en.wikipedia.org/wiki/Quine

  I wonder what a quine in haskell would look like.

-- 
                                                          - Warp

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Warp <war### [at] tagpovrayorg> wrote:
>   It's just incredible how he could store the *shapes* of all four programs
> inside a single self-replicating program.

I don't know exactly how he did it, but if I had to do it, I would use 1/3 of
the junk at the beginning to define each image (It actually looks like he's
divided them in half).  I would RLE compress the image and add or subtract a
constant until the ascii values were all in the printable range.  If you just
reprint the data section each time with different whitespace and the same
program at the end, maybe you could pull it off.  That's a million miles away
from actually pulling it off, but maybe it would work.

 - Ricky

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Warp <war### [at] tagpovrayorg> wrote:
>   I wonder what a quine in haskell would look like.

Not sure, but this is a particularly short quine, written in c:

http://www0.us.ioccc.org/1994/smr.c
http://www0.us.ioccc.org/1994/smr.hint

 - Ricky

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On Fri, 28 Aug 2009 08:34:34 -0400, Warp wrote:

>   Most self-replicating programs just replicate themselves, and that's
>   it.
> No ascii art either.

One of the most impressive of these that I've ever seen was from the 
IOCCC - I can't seem to find the right keywords, but it did something 
similar to this but used more than one programming language (ie, #1 was 
C, #2 was maybe Pascal, #3 was C again).  Wish I could find it now.

Jim

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triple_r <nomail@nomail> wrote:
> Not sure, but this is a particularly short quine, written in c:

> http://www0.us.ioccc.org/1994/smr.c
> http://www0.us.ioccc.org/1994/smr.hint

  That program doesn't link. The linker cannot find the main() function.

-- 
                                                          - Warp

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>>   Most self-replicating programs just replicate themselves, and that's
>>   it.
>> No ascii art either.
> 
> One of the most impressive of these that I've ever seen was from the 
> IOCCC - I can't seem to find the right keywords, but it did something 
> similar to this but used more than one programming language (ie, #1 was 
> C, #2 was maybe Pascal, #3 was C again).  Wish I could find it now.

I found a program (I forget what it did) that was runnable in multiple 
languages simultaneously...

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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Orchid XP v8 wrote:
> I found a program (I forget what it did) that was runnable in multiple 
> languages simultaneously...

I  saw that.  And not similar languages. Like, javascript, awk, Haskell, and 
C++ or something.

The one I liked was the one that output its own source code in the shape of 
a maze, and then solved itself.

-- 
   Darren New, San Diego CA, USA (PST)
   Understanding the structure of the universe
    via religion is like understanding the
     structure of computers via Tron.

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On Fri, 28 Aug 2009 20:11:47 +0100, Orchid XP v8 wrote:

>>>   Most self-replicating programs just replicate themselves, and that's
>>>   it.
>>> No ascii art either.
>> 
>> One of the most impressive of these that I've ever seen was from the
>> IOCCC - I can't seem to find the right keywords, but it did something
>> similar to this but used more than one programming language (ie, #1 was
>> C, #2 was maybe Pascal, #3 was C again).  Wish I could find it now.
> 
> I found a program (I forget what it did) that was runnable in multiple
> languages simultaneously...

Hmmm, maybe that's the one I am remembering - though I was sure there was 
a code generator involved in it...

Jim

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Warp <war### [at] tagpovrayorg> wrote:
> > http://www0.us.ioccc.org/1994/smr.c
> > http://www0.us.ioccc.org/1994/smr.hint
>
>   That program doesn't link. The linker cannot find the main() function.

I think the hints said there was some tricky compile flags to force it to
compile.  Turns out this is how you compile it:

cp smr.c smr
chmod +x smr

That doesn't seem valid, but I guess that's how you abuse rules and get them
changed.

 - Ricky

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Darren New schrieb:
>> I found a program (I forget what it did) that was runnable in multiple 
>> languages simultaneously...
> 
> I  saw that.  And not similar languages. Like, javascript, awk, Haskell, 
> and C++ or something.

I actually encountered something close to this in real-life work: It was 
a file designed to be included in both a C program and a makefile, to 
define certain constants.

And typically, pulling this off is even easier if the languages are 
quite different, as the most typical way to do it is by having one 
language see comments where the other one doesn't.

For instance, to fuse POV-Ray SDL and Lua code, you can use the 
following pattern:


#version 3.7; /* (Lua ignores first line if it starts with "#")

   -- Lua code goes here

--[=[ */

   // POV-Ray SDL code goes here

// ]=]

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