I don't think I can learn C....

[Atheist]

Found this source code example on the net...

/*
As an extreme example the following C code (mystery.c) is actually legal C code.


#include

main(t,_,a)
char *a;
{return!0main(-86, 0, a+1 )+a)):1,t<_?main(t+1, _, a ):3,main ( -94, -27+t, a
)&&t == 2 ?_<13 ?main ( 2, _+1, "%s %d %d\n" ):9:16:t<0?t<-72?main(_,
t,"@n'+,#'/*{}w+/w#cdnr/+,{}r/*de}+,/*{*+,/w{%+,/w#q#n+,/#{l,+,/n{n+\
,/+#n+,/#;#q#n+,/+k#;*+,/'r :'d*'3,}{w+K w'K:'+}e#';dq#'l q#'+d'K#!/\
+k#;q#'r}eKK#}w'r}eKK{nl]'/#;#q#n'){)#}w'){){nl]'/+#n';d}rw' i;# ){n\
l]!/n{n#'; r{#w'r nc{nl]'/#{l,+'K {rw' iK{;[{nl]'/w#q#\
n'wk nw' iwk{KK{nl]!/w{%'l##w#' i; :{nl]'/*{q#'ld;r'}{nlwb!/*de}'c \
;;{nl'-{}rw]'/+,}##'*}#nc,',#nw]'/+kd'+e}+;\
#'rdq#w! nr'/ ') }+}{rl#'{n' ')# }'+}##(!!/")
:t<-50?_==*a ?putchar(a[31]):main(-65,_,a+1):main((*a == '/')+t,_,a\
+1 ):0i@bK'(q)-[w]*%n+r3#l,{}:\nuwloca-O;m .vpbks,fxntdCeghiry"),a+1);}
*/

AmigaOne! Dumbfounded!!

[xeron]

Ahh yes. Reminds me of the obfuscated C competitions. I've seen some C sources like that that were shaped like a train or a whale, which is fun.

Nice example there; interesting use of recursion and the ? operator. I also didn't realise '_' was a legal variable name.

Of course, some languages like Brainf**k, Perl and my own "Bonk" are pretty obfuscated as a matter of course  :-D

[Frodon]

On the first day of Christmas my true love gave to me
a partridge in a pear tree.

On the second day of Christmas my true love gave to me
two turtle dovesin a pear tree.

On the third day of Christmas my true love gave to me
three french hens, two turtle doves

On the fourth day of Christmas my true love gave to me
four calling birds, three french hens, two turtle doves

On the fifth day of Christmas my true love gave to me
five gold rings;ds, three french hens, two turtle doves
and a partridge in a pear tree.

On the sixth day of Christmas my true love gave to mees
and a partridge in a pear tree.

On the eighth day of Christmas my true love gave to me
eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the ninth day of Christmas my true love gave to me
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

On the tenth day of Christmas my true love gave to me
ten lords a-leaping,
and a partridge in a pear tree.

ten lords a-leaping,Christmas my true love gave to me
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

eleven pipers piping, ten lords a-leaping,ove gave to me
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

twelve drummers drumming, eleven pipers piping, ten lords a-leaping,
nine ladies dancing, eight maids a-milking, seven swans a-swimming,
six geese a-laying, five gold rings;
four calling birds, three french hens, two turtle doves
and a partridge in a pear tree.

[xeron]

Is that what it does? thats really cool  :-D

Edit: Just compiled it, and yes it does. Thats very clever, i'm impressed!

[Karlos]

That's cool.

Recursive call to main() :-)

I'd guess this source was generated by a program rather than created by hand, though I may be wrong :-D

-edit-

_ is a perfectly legal name. Not very useful, but legal :-D

[Karlos]

It actually looks like this thing I saw once...

A program which takes a text file and generates an encryption of it that is expressed in program flow code, execution reconstitutes the text file.

But that was in Pascal :-) Maybe somebody ported it?

As an excersise, reformat the source and see if you can disentangle it :lol:

[Atheist]

Hello Frodon or Tickly,

I was wondering, how many bytes is the compiled code?

AmigaOne! Dumbfounded + Amazed!


P.S. Found it here http://www.cs.cf.ac.uk/Dave/C/node4.html#SECTION00460000000000000000

[Karlos]

Atheist wrote:
Hello Frodon or Tickly,

Gee, hi to you too :-D Something I said? (joking)

[Crumpster]

That's Cool,

I compiled it in gcc no probs, (well had to uncomment it 1st)
Now all I have to do is figure out how it does it.

Stay tuned folks I'm sure I'll figure it out by this time next year!!  :-D

Cheers,

Crumpster

[Karlos]

Strictly speaking it uses obsolete K&R function syntax in the declaration of main.

You should *cough* try

int main (int t, int _, char* c)
{
...
}

instead :-)

[Crumpster]

@ Athiest

Compiled size here (RedHat 7.3 / gcc 2.96) is 14540 bytes or 14ish Kb.

Cheers,

Crumpster


Changed the Kb size to 14 - cheers Karlos

[Karlos]

You mean 14ish Kb?

[Atheist]

Karlos wrote:

Atheist wrote:
Hello Frodon or Tickly,

Gee, hi to you too :-D Something I said? (joking)

I didn't say hi, because, you didn't compile it, and therefore, didn't have an answer to that question, speaking of which...

Hello Crumpster,

gcc, so that would be PPC and therefore RISC, so how many bytes was it, when you compiled it?

Thanks, I just HAD to know.


AmigaOne! C(++), ...phew!! Challenging!

[Karlos]

Atheist wrote:

I didn't say hi, because, you didn't compile it, and therefore, didn't have an answer to that question, speaking of which...

Nope, but I will tonight :-D

BTW, doesn't have to be PPC just because he used gcc. There is gcc-68K / x86 / mips etc. etc. too :-)

It's a pretty funky code example, huh?

I still think this was generated by a machine - or a serious (and frighteningly clever) geek :-)

[Crumpster]

@ Karlos

yep 14 ish Kb sorry finger slipped on the decimal point
(I obviously can't count, did I cover it ok?  :-P )

Thanks fo the correction.

@ Athiest

Not on an A1 yet I'm afraid, crappy works P2 233Mhz with redhat 7.3 on it.

Cheers

Crumpy