Xref: utzoo comp.misc:5572 comp.lang.c:17065
Path: utzoo!attcan!uunet!mcvax!hp4nl!botter!star.cs.vu.nl!maart
From: maart@cs.vu.nl (Maarten Litmaath)
Newsgroups: comp.misc,comp.lang.c
Subject: Re: Silly programming problems
Message-ID: <2179@fireball.cs.vu.nl>
Date: 17 Mar 89 16:57:38 GMT
References: <817@krafla.rhi.hi.is>
Organization: V.U. Informatica, Amsterdam, the Netherlands
Lines: 31

frisk@rhi.hi.is (Fridrik Skulason) writes:
\	   "write a one line C program that produces the source code
\	   to itself when run."

Spoilers:

Actually a 2 liner (doesn't exceed 80 character limit):
----------8<----------8<----------8<----------8<----------8<----------
char*p="char*p=%c%s%c%c;main(){printf(p,34,p,34,10,10);}%c"
;main(){printf(p,34,p,34,10,10);}
----------8<----------8<----------8<----------8<----------8<----------

A true 1 liner (join the 2 lines):
----------8<----------8<----------8<----------8<----------8<----------
char*p="char*p=%c%s%c;main(){printf(p,34,p,34,10);}%c";main(){printf(p,34,p,34,
10);}
----------8<----------8<----------8<----------8<----------8<----------

The program below won't print a terminating newline, so the source shouldn't
contain '\n'. (Is this OK with ANSI?)
----------8<----------8<----------8<----------8<----------8<----------
char*p="char*p=%c%s%c;main(){printf(p,34,p,34);}";main(){printf(p,34,p,34);}
----------8<----------8<----------8<----------8<----------8<----------

A cheat.
----------8<----------8<----------8<----------8<----------8<----------
main(){execlp("cat","",__FILE__,(char*)0);}
----------8<----------8<----------8<----------8<----------8<----------
-- 
 Those against Rushdie haven't          |Maarten Litmaath @ VU Amsterdam:
   learned anything from the Dark Ages. |maart@cs.vu.nl, mcvax!botter!maart