Science Fair Project Encyclopedia
Argh! and Aargh!
Argh! and Aargh! are Befunge-like esoteric programming languages (i.e. languages deliberately designed to be strange, with utility not an objective).
Argh! and Aargh! share a two dimensional layout. Both are limited to 80 columns wide but while Argh! is also limited to 40 rows, Aargh! has unlimited number of rows. Each command is a single character and occupies one cell of the grid; a cell can alternately contain a value. The language also supports a stack of theoretically unbounded size. There are 27 documented commands.
The following program prints out "Hello, Wikipedia!":
j Wikipedia! lpppppppPPPPPPPPPPq Hello,
Explanation of the above program: execution begins with the j in the top row leftmost column, which indicates the starting direction of execution is down. The next command executed is the l which means process commands to the right. Each of 'p's indicates that the value below it should be printed; each P that the value above it should be printed. The q (for quit) command marks the end of the program.
A program that tries to execute a value that is not a command, or that tries to execute outside the grid, emits the language's standard error message, Argh! or Aargh! as appropriate, and terminates.
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