THRAT
THRAT is a Brainfuck-derived esoteric programming language devised by Mate Varga in 2004. It uses two instructions to select from a table of ten operations, in the style of ReMorse.
Like Brainfuck, THRAT has a memory block (4096 bytes by default) and a memory pointer that points to a single byte in the block.
The ten operations are the eight from Brainfuck plus two more:
| # | Description |
|---|---|
| 0 | Halt program execution |
| 1 | Increment the memory cell under the pointer |
| 2 | Decrement the memory cell under the pointer |
| 3 | Move the pointer to the right |
| 4 | Move the pointer to the left |
| 5 | Jump past the matching 6 if the cell under the pointer is 0
|
| 6 | Jump back to the matching 5
|
| 7 | Output the value of the cell under the pointer as a number |
| 8 | Output the character signified by the cell at the pointer |
| 9 | Input a character and store it in the cell at the pointer |
There is an operation pointer which points to a single operation (initially the first). The ; instruction increments the operation pointer by 1, and the : instruction executes the operation which is currently pointed at.
Computational class
The THRAT commands are a proper superset of Brainfuck's, with no special restriction on the execution of arbitrary commands at arbitrary points; the THRAT specification also does not preclude having an unbounded store (either a block of infinite size, or a block which grows when the bounds are exceeded.) So THRAT is in the same computational class as Brainfuck. Brainfuck is Turing-complete, so THRAT is Turing-complete as well.
See also
External resources
- Author's THRAT page (from the Wayback Machine; retrieved on 1 September 2005)