Here's another good one:
/*
* Program to compute an approximation of pi
* by Brian Westley, 1988
*/
#define _ -F<00||—F-OO—;
int F=00,OO=00;
main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO()
{
---
--------
-----------
-------------
--------------
--------------
---------------
---------------
---------------
---------------
--------------
--------------
-------------
-----------
-------
---_
}
See also {hello, world}.
:obi-wan error: /oh'bee-won` er'*r/ [RPI, from `off-by-one' and the Obi-Wan Kenobi character in "Star Wars">[ n. A loop of some sort in which the index is off by 1. Common when the index should have started from 0 but instead started from 1. A kind of {off-by-one error}. See also {zeroth}.
:Objectionable-C: n. Hackish take on "Objective-C", the name of an object-oriented dialect of C in competition with the better-known C++ (it is used to write native applications on the NeXT machine). Objectionable-C uses a Smalltalk-like syntax, but lacks the flexibility of Smalltalk method calls, and (like many such efforts) comes frustratingly close to attaining the {Right Thing} without actually doing so.
:obscure: adj. Used in an exaggeration of its normal meaning, to imply total incomprehensibility. "The reason for that last crash is obscure." "The `find(1)' command's syntax is obscure!" The phrase `moderately obscure' implies that it could be figured out but probably isn't worth the trouble. The construction `obscure in the extreme' is the preferred emphatic form.
:octal forty: /ok'tl for'tee/ n. Hackish way of saying "I'm drawing a blank." Octal 40 is the {{ASCII}} space character, 0100000; by an odd coincidence, {hex} 40 (01000000) is the {{EBCDIC}} space character. See {wall}.
:off the trolley: adj. Describes the behavior of a program that malfunctions and goes catatonic, but doesn't actually {crash} or abort. See {glitch}, {bug}, {deep space}.
:off-by-one error: n. Exceedingly common error induced in many ways, such as by starting at 0 when you should have started at 1 or vice versa, or by writing `< N' instead of `<= N' or vice-versa. Also applied to giving something to the person next to the one who should have gotten it. Often confounded with {fencepost error}, which is properly a particular subtype of it.