Contest :-)

Ok Guys a friend of mine wrote this code and i wanna see if we have some good C++ programmers in this forum :-)

Anyone that can figure out how this code works and post a good explanation WINS

Code:

---

#include <stdio.h>
#define _____ char
#define ____ int
#define _ main
_____ ______[]="]a`z)`z)Clp. z)Fko|zjh}lm)Aleef)^f{em)lqhdyel()@})`z)jfyp{`na})
 ;998)kp)Clphzhgbh{)Bf}}hehd'\3\3^`}af|})o|{}al{)hm
f%)al{l.z)}al)dlzzhnl3)ALEEF%)^F[EM((";_(____ __, _____ ** _______){__>0?_(0,(_____**)______) (_____*)_______)[-__] == '\0'?putchar(10) utchar(((_____*)_______)[-__]^9)?_(--__,_______):_(__,++_______);}

---

It doesn't even compile like that so I'm doing the expansions by hand %-)

Ooh, recursive main(), these are always fun...

Code:

---

#include <stdio.h>

char str[] = "]a`z)`z)Clp. z)Fko|zjh}lm)Aleef)^f{em)lqhdyel()@})`z)jfyp{`na})\n ;998)kp)Clphzhgbh{)Bf}}hehd'\3\3^`}af|})o|{}al{)hm\nf%)al{l.z)}al)dlzzhnl3)ALEEF%)^F[EM((";

main (int argc, char  ** argv) {
    char* p = str;
    while(*p) {
        putchar(*p ^ 9);
        ++p;
    }
}

---

Recursion removed :D

What I did was look for where it was going, and with the calling of main with argc increased each time, looks like it's using main to loop through a string. That done, it XORs the character with 9 and prints it. I also had to replace the actual newlines in the string with '\n' characters.

This gives the message:

Code:

---

This is Jey')s Obfuscated Hello World example! It is copyright )2001 by Jeyasankar Kottalam.

Without further ado, here's the message: HELLO, WORLD!

---

Not bad considering the code you gave doesn't compile :p

Hmm, just noticed those spurious brackets...

Code:

---

#include <stdio.h>

const char str[] = "]a`z)`z)Clp.z)Fko|zjh}lm)Aleef)^f{em)lqhdyel()@})`z)jfyp{`na})\n;998)kp)Clphzhgbh{)Bf}}hehd'\3\3^`}af|})o|{}al{)hm\nf%)al{l.z)}al)dlzzhnl3)ALEEF%)^F[EM((";

int main (int argc, const char **argv) {
    const char* p = str;
   
    while(*p) {
        putchar(*p ^ 9);
        ++p;
    }
   
    putchar('\n');
}

---

Done.

Woah, why write such a thing?

I guessed at how to solve this, but I'm sure I'd have been too lazy...

Good job, parksie.

btw it is less a matter of being a good C++ programmer, but more of knowing such obscure things like trigraph sequences.

I have extended the thing a little bit.
But I mostly copied the original, so it still won't compile.

Code:

---

??=include <stdio.h>
??=define _____ char
??=define ____ int
??=define _ main
_____ ______??(??)="??)a`z)`z)Clp. z)Fko??!zjh??>lm)Aleef)??'f??<em)lqhdyel()@??>)`z)jfyp??<`na??>)
 ;998)kp)Clphzhgbh??<)Bf??>??>hehd'??/3??/3??'`}af??!??>)o??!??<??>al??<)hm
f%)al??<l.z)??>al)dlzzhnl3)ALEEF%)??'F??(EM((";____ _(____ __, _____ ** _______)??<__&gt;0?_(0,(_____**)______) (_____*)_______)??(-__??) == '??/0'?putchar(10) utchar(((_____*)_______)??(-__??)??'9)?_(--__,_______):_(__,++_______);??>

---

The "utchar" is also a typo.

Quote:

---

Originally posted by CornedBee
Woah, why write such a thing?

I guessed at how to solve this, but I'm sure I'd have been too lazy...

Good job, parksie.

---

Agree =). But obfuscating hello world isnt a big deal... Obfuscate Halflife =P.

Z.

Nice Job parksie
:-)

I'm suspicious though. How did your friend write it? You haven't been allowed to get away with code like that without specifically compiling it as "old" C...

I dont know ill refer him to this forum and have him post an answer

I wrote this code once. It's legal C++.
Don't cheat by running it!

Code:

---

??=define e(r)e??=#??=??=??=??=#??=r
??=define b(e)""??=#??=e??=#""
??=define t(i)()r(??<)#??=??/
e(t)#??=urn(i??=#??=??=??/
b(y)??=??=i#??="")+((3??'(0??=#x2??!1))??!
??=define r(i)i#??=#??=??=??=r
??=include<iostream>
??=define i(i)in??=#t ma??=??=in()??<??/
st??=??=d::cou??=??=t<#??=r(<i;)??=#e(t)#??=ur#??=n 0??'0
??=define d(t) i(b(h)??=#"i"??=#b(??/?)??/
<??=#<std::??=??=e(ndl<)??=??=<'b'<#??=<e(r)())
r(cha)*r(e) t(b(e)"??/41")2);??>d(??!/\??\
??=ine i(i)in??=#t ma??=??=in)??!0;??>

---

When I first wrote it, it output Dutch, it took me 30 minutes just to convert it to English.

Note to self: Never write code like that again!

Most of it's just trigraphs. :)

You're right, I wrote this code when I learned about trigraphs (found a link in MSDN library) Without the trigraphs it's just a bunch of macros