C programming puzzle

smeezekitty · 11-19-2009, 03:53 PM

Coolin' down from all the flame wars about making good code, its time to test how somone is at decoing bad code:
can you tell what this does without running it:

Code:

#include <conio.h>
#define DZF92(c, x) (((c)==0)?0:(((x%2)==0)?(c-1):(c-2)))
void pstx(char *s){
int i = 0;
while(putch(DZF92(s[i], (++i)))){
if(DZF92(s[i], i) == ','){gotoxy(wherex() + 1, wherey());}
}
}
int main(){
char boopalot[] = {' ', 74, 102, 110, 109, 113, 45, 121, 112, 116, 109, 102, 34, 0};
pstx(boopalot);
return 0;
}

mjones490 · 11-19-2009, 04:18 PM

Looks to me like it prints "Hello, world!" on the screen.

smeezekitty · 11-19-2009, 06:58 PM

Quote:

Originally Posted by mjones490

Looks to me like it prints "Hello, world!" on the screen.

LOL you must have ran it.

sarum1990 · 11-19-2009, 07:15 PM

That's pretty cool, I actually went through it line by line. Awhile ago I stumbled across a single file that was, a bash program, a Makefile, and C source code, all with very tricky comment notation so that if you made the file executable, you could like run it 3 times and compile and run a C program. That was probably the craziest obfuscation I've seen in code. Can't find it now, but it was really interesting.

mjones490 · 11-20-2009, 08:05 AM

Quote:

Originally Posted by smeezekitty

LOL you must have ran it.

I ran it on my brain.

No, it's just that I've seen enough obfuscated "Hello, World!" programs to recognize the ASCII codes for the letters, and with the little "subtract one from every other character", that accounts for the simple mutations in the codes.

mjones490 · 11-20-2009, 08:13 AM

My favorite obfuscated program is the one with three lines of mostly parentheses, that when you run it it prints out a naked woman showing her poonanners to the whole world.

smeezekitty · 11-23-2009, 01:23 AM

Quote:

Originally Posted by mjones490

My favorite obfuscated program is the one with three lines of mostly parentheses, that when you run it it prints out a naked woman showing her poonanners to the whole world.

obfuscation is fun!