index.md

9lang

9lang is an esoteric programming language. A 9lang program ends with the .9 extension. A 9lang program is made of 3x3 instruction grid. Each caracter can be either a space or any other caracter. The first instruction to be executed is the one at 0:0. When the program starts, the direction is right. The interpreter is named 9. You can call it just using the 9 <program path> command (if the command path contains spaces put " around it).

Examples

o oo oo o   o o
    o     o  o
   o o      o o

This program just prints an x character to stdout.

Note: here the o character is used. We migth use any other character instead but space.

Explanation

(.s represent spaces and Xs represent any other character)

• X.X
  ...
  ...
  

  enable the ascii mode.

• X.X
  .X.
  X.X
  

  (In ascii mode) stack the 'x' character.

• X.X
  ...
  ...
  

  (In ascii mode) disable the ascii mode.

• ...
  .X.
  ...
  

  unstack a character and print it to stdout.

• X.X
  .X.
  X.X
  

  exit the program.