Double
| Designed by | Lim95 |
|---|---|
| Appeared in | 2022 |
| Memory system | Cell-based |
| Dimensions | One-dimensional |
| Computational class | Turing complete |
| Major implementations | Original (Python), IDE (Created by Vivax) |
| File extension(s) | .txt, .dbl |
Double is an esolang created by Lim95 on July 5th, 2022. It was programmed over the course of two hours on a livestream. Double's main feature is that each instruction must be two characters long. All numbers are written in Hexadecimal and cannot go above 255 (or FF). Comments must be placed on their own line and are marked with a single forward slash (/)
| Command | Token | What it does | Version introduced | Arguments |
|---|---|---|---|---|
| PV | 0 | Prints the value of the current cell. | 1.0 | None |
| PC | 1 | Prints the character of the current cell. | 1.0 | None |
| SX | 2 | Sets the X coordinate of the current cell. | 1.0 | Value |
| SY | 3 | Sets the Y coordinate of the current cell. | 1.0 | Value |
| IX | 4 | Increments the X coordinate of the current cell. | 1.0 | None |
| IY | 5 | Increments the Y coordinate of the current cell. | 1.0 | None |
| DX | 6 | Decrements the X coordinate of the current cell. | 1.0 | None |
| DY | 7 | Decrements the Y coordinate of the current cell. | 1.0 | None |
| SV | 8 | Sets the value of the current cell. | 1.0 | Value |
| IV | 9 | Increments the value of the current cell. | 1.0 | None |
| DV | 10 | Decrements the value of the current cell. | 1.0 | None |
| RS | 11 | Restarts the program (sets the pointer to 0) | 1.0 | None |
| CR | 12 | Restarts the program if the value provided is not equal to the value of the current cell. (BNE) | 1.0 | Condition |
| GC | 13 | Get the character ID of a character the user types in. If there's an error, return 255. | 1.0 | None |
| GV | 14 | Get the value of a hexadecimal number the user types in. | 1.0 | None |
| XV | 15 | Set the value of the current cell to the X coordinate. | 1.0 | None |
| YV | 16 | Set the value of the current cell to the Y coordinate. | 1.0 | None |
| JM | 17 | Jump to a specified location. | 1.0 | Address |
| CJ | 18 | Jump to a specified location if the first value is not equal to the value of the current cell. | 1.0 | Condition, Address |
| ** | 19 | Replaces any value with the value of the current cell. | 1.0 | None |
| JF | 20 | Jumps forward the specified amount of instructions. | 1.1 | Address |
| JB | 21 | Jumps backward the specified amount of instructions. | 1.1 | Address |
| CF | 22 | Jumps forward if the condition is not the current cell's value. | 1.1 | Condition, Address |
| CB | 23 | Same as CF, but with backwards. | 1.1 | Address |
| GS | 24 | Get a string and store it across the Y axis. | 1.2 | None |
| JR | 25 | Jumps to a subroutine and pushes the pointer on to the stack. | 1.3 | Address |
| RR | 26 | Returns from a subroutine. | 1.3 | None |
| RC | 27 | Jumps to a subroutine conditionally. | 1.3 | Condition, Address |
| BC | 28 | Returns from a subroutine conditionally. | 1.3 | Condition |
| RN | 29 | Generates a random 8-bit integer (0 - 255) and stores it into the current cell. | 1.4 (Changed 1.5) | None |
| US | 30 | Updates the screen. | 1.5 / DGR-3 | None |
Example Programs
Note: All programs are written for the JavaScript interpreter. Compatibility may vary based on the interpreter.
Hello, World!
."Hello, world!"
Hello Interpreter
GC
CR #H
."Hello, World!"
Adder (created by vivax3794)
DV IX IV DX CR FF IX DV PV GV DX GV RS
Cat Program
GS PC IX CJ FF 01
99 Bottles of Beer
SV 03
SONG:
PV SX 01
."bottles of beer on the wall,"
SV 0A PC
SX 00 PV SX 01
."bottles of beer! Take one down, pass it around,"
SV 0A PC
SX 00 DV PV SX 01
."bottles of beer on the wall!"
SV 0A PC
SX 00
CJ 00 SONG
SX 01
."No more bottles of beer on the wall!"
Brainfuck interpreter (created by vivax3794)
IX SV FF IY GS IY SV FF
SY 00 SX 00 IX CB FF 01 SV 00 IX SV FF DX IY
CF FF 05 JM XX
CF 3E 12 SY 02 SX 00 IX CB FF 01 SV 00 IX SV FF JM 08
CF 3C 12 SY 02 SX 00 IX CB FF 01 SV 00 DX SV FF JM 08
CF 2B 0F SY 02 SX 00 IX CB FF 01 IY IV JM 08
CF 2D 0F SY 02 SX 00 IX CB FF 01 IY DV JM 08
CF 2C 0F SY 02 SX 00 IX CB FF 01 IY GC JM 08
CF 2E 0F SY 02 SX 00 IX CB FF 01 IY PC JM 08
CF 5B 3B SY 02 SX 00 IX CB FF 01 IY CJ 00 08
SY 00 SX 00 IX CB FF 01 SV 00 DX SV 01
IY DY DV IX IV DX CB 00 04 IX IY CF 5B 07 DY IV JB 0E CB 5D 11 DY DV CB 00 15
IX SV FF JM 08
CF 5D 3B SY 02 SX 00 IX CB FF 01 IY CF 00 05 JM 08
SY 00 SX 00 IX CB FF 01 SV 00 DX SV 01
IY DY DV DX IV IX CB 00 04 DX IY CF 5D 07 DY IV JB 0E CB 5B 11 DY DV CB 00 15
IX SV FF JM 08
Assembler
The Assembler is an external piece of software designed to make programming in Double slightly easier. You can use labels like in Assembly.
You can define a label with the following syntax: LABEL_NAME:
You can jump to a label with the following syntax: JM LABEL_NAME
Labels must be no spaces.
You can quickly define text with .". An example would be ."HELLO~WORLD". ~ replaces space.
By typing #(CHAR) you can get the hex ASCII code of a character.
Screen
In the 1.5 update of Double, a visual add-on was released. To use it, download DoubleVisual.py from the Double's GitHub page. It has a 4-bit palate, 64x64 resolution, and 10x pixel scaling.
A simple program to test it is:
IX XV
CR 40
IY
SX 00
YV
CR 40
XV US
RS