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[Mephisto]

Can I post something in CP if I'm not the one that created it? Too bad, I'm going to anyway.

I saw this bewildering collection of hashes, parentheses, and gibberish. Foolishly, not considering the security risk of running code when I have no idea what it does, I copy it into Leafpad, modify it as per the OP in the link, and save it as a .c file. I compile and run and am surprised at how much info is packed in that short snippet. The code is completely harmless.

Unlike the linked post, the source file is two lines rather than one. Line 1 is the #include and line 2 is the rest of the stuff. Copy everything to <somefile>.c.

Code: [Select]

gcc <somefile>.c -o <somefile>Then run it. The author is correct when he said he should have waited until Christmas.

Just so this isn't utterly useless, does anyone else have any examples of such practices?

[Puzzlemaker]

Wow.

That's impressive.

And what does it do?

[Mephisto]

It's quite boring. All it does is print out the full "Twelve Days of Christmas" song.

[Puzzlemaker]

H... How?

I don't... see... twelve days of Christmas...   

[SolarShado]

H... How?

I don't... see... twelve days of Christmas...  

I wouldn't know how to begin de-ciphering it, but in quick look over I saw what appears to be a call to main(), that and the fact that main()'s first line is a return statement tells me that there's some recursion going on there.

[Puzzlemaker]

Is... Is that a variable called _?

And you're right, it is recursive.  Interesting...

It also uses copious amounts of that freaking shorthand if statements.  You know, the Blah?Blah:Blah things. 

I don't get what all the #'s are though... that part is really confusing me.  If anyone could shed light on that, that would be great.

I also can't figure out where the actually printing to the screen is... maybe that putchar?  Hmm...

[SolarShado]

Is... Is that a variable called _?

From what I've seen, that's fairly common in these sort of things.

And I love ?: constructs, but I do try to avoud them when I can. They do make code a bit harder to read.

[Derakon]

If you want to see more code like this, check out the International Obfuscated C Contest. Specifically, this page has previous winners.