xmas.c

/*
 * This is without a doubt one of the greatest computer programs ever written
 * and will forever stand as a monument to skill and artistry in defiance of
 * standards, maintainability and productivity. Note the entire program is a
 * single line of code.
 *
 * It is regrettably difficult to compile K&R C in 2019, so I've updated it to
 * ANSI C to build and run cleanly with GCC, Clang & Visual C.
 *
 * Some changes were necessary to compile. Others suppress warnings without
 * resorting to compiler options or pragmata. All changes have been made in
 * limited ways to minimize the intrusion and preserve the opacity and spirit
 * of the original code.
 *
 * This surgery is limited to
 * 1. Some preprocessor directives and a typedef before main() for the purpose
 *    of type conversion.
 * 2. Conversion of argument syntax from K&R to ANSI.
 * 3. Conformity with the ANSI signature of main().
 * 4. Some stack variables at the start of main to facilitate said type safety
 *    and conformity.
 * 5. Explicitly casting the return value of main.
 *
 * Jimmy Dee
 * July 23, 2019
 *
 * All comments after this block from the original source unless signed. --JD
 */

/*
LEAST LIKELY TO COMPILE SUCCESSFULLY:
  Ian Phillipps, Cambridge Consultants Ltd., Cambridge, England

  An appropriate program for December 25th, this consists primarily of
  calls to main() combined by a lot of the ternary conditional (?:)
  operators. Have you ever seen a more forceful return? The judges note
  that this program looked like what you would get by pounding on the keys
  of a type writer at random.

  Note -- I have made a minor correction (for spelling) to line 47, where I
  added a missing comma at column 59.
*/

#include <stdint.h>
#include <stdio.h>
typedef intptr_t L;
#define MAIN(t, u, v) main(t, (char**)(u), (char**)(v))
#define T (L)t

int
main(int t,char**u,char**v)
/*
 * With apologies to Brian Kernighan and Dennis Ritchie. --JD
main(t,_,a)
char
*
a;
 */
{
L _ = (L)u;
char* a = (char *)v;
/*
 * Where Java would throw a NullPointerException, in C we retain some capacity
 * for creativity and can put a NULL pointer to good use. --JD
 */
L q = 0[a];
return!

0<t?
t<3?

MAIN(-79,-13,a+
MAIN(-87,1-_,
MAIN(-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;# ){nl]!/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(31[a]):

MAIN(-65,_,a+1)
:
MAIN((*a == '/') + t, _, a + 1 )
:

0<t?

MAIN ( 2, 2 , "%s")
:*a=='/'||

MAIN(0,(L)

MAIN(-61,q, "!ek;dc i@bK'(q)-[w]*%n+r3#l,{}:\nuwloca-O;m .vpbks,fxntdCeghiry")

,a+1);}