Vrejvax
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Vrejvax is a three- or five-instruction Boolfuck derivative designed by User:Nortaneous in 2008. An interpreter was written by User:Madk in 2010. There is an incomplete interpreter written in QuickBASIC available here. (dead link)
Pronunciation
The name is represented in IPA as vɹeɪ̯vax. "Vrejvax" is a contraction of the Foolang (dead link) phrase "vrejas vaxra", meaning "mind-fucker".
Instructions
| Instruction | Description |
|---|---|
+
|
Flip the current bit and increment the pointer. |
<
|
Decrement the pointer. |
?
|
If the current bit is a 1, jump to the instruction located at the position given by the byte to the immediate right of the current bit; if that byte is zero, add 256 to the location of the byte after that and jump to the instruction given by that; if that byte is zero, add 256 again and get the next byte, and so on. |
,
|
Same as boolfuck. |
.
|
Same as boolfuck. |
The , and . instructions are not required for Turing completeness, so they can be omitted.
Example code
Hello World
+<+++<++<++<<<<<.+<++<+++<++++<++<<<<<<<<.+<++<++<++<+++<++<++<<<<<<<<..+<++<++<++<++<++<+++ <<<<<<<<.+<+++<++<+++++<<<<<<<<.+<+++++<++++<<<<<<<<.+<++<++++<<<<<.+<++<++<+++++<++<<<<<<<< .+<++<++<++++++<+<<<<<<<<.+<++<++<++<+++<++<++<+<<<<<<<<.+<+++<++<++<+++<++<<<<<<<<.
Cat
,.