n. An annual contest run since 1984 over USENET by Landon Curt Noll and friends. The overall winner is whoever produces the most unreadable, creative, and bizarre (but working) C program; various other prizes are awarded at the judges' whim. C's terse syntax and macro-preprocessor facilities give contestants a lot of maneuvering room. The winning programs often manage to be simultaneously (a) funny, (b) breathtaking works of art, and (c) horrible examples of how *not* to code in C.
This relatively short and sweet entry might help convey the flavor of obfuscated C:
* HELLO WORLD program
* by Jack Applin and Robert Heckendorn, 1985
Here's another good one:
* Program to compute an approximation of pi
* by Brian Westley, 1988
#define _ -F<00||--F-OO--;
See also hello, world.