Double

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), Flask (Created by me)
File extension(s)	.txt, .dbl

Double's logo

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. Comments are marked with a couble forward slashes (//)

To run a program, either use "python3 double.py/main.py -r [code]" or "python3 double.py/main.py -f [filename]".

Double Commands

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 X axis.	1.2 (Changed 1.6)	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
DB	31	It's a data block. End it with a 0xFF (255) byte.	1.6	Any amount, end with 0xFF (255)
PS	32	Prints a string in memory across the X axis.	1.6	None
+C	33	Add the value of the current cell to the Accumulator.	1.6	None
-C	34	Subtract the value of the current cell from the Accumulator.	1.6	None
IC	35	Increment the value of the Accumulator.	1.6	None
DC	36	Decrement the value of the Accumulator.	1.6	None
SA	37	Set the value of the Accumulator.	1.6	Value
AV	38	Get the value of the Accumulator.	1.6	None
PH	39	Push the value of the current cell onto the Stack.	1.6	None
PL	40	Pull the top value of the Stack into the current cell.	1.6	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

Adder (by Lim95)

GV IX GV DX +C IX +C IX AV PV

Cat Program (1.6 Version)

GS SX 00 PS

Old IV PC RS (1.6)

IV PC CR 255 SV 0 RS

dbpk

dbpk is the Double Package Manager. Use the terminal to run python3/py dbpk search * to see all packages, and install something with install [name].

Screen

In the 1.5 update of Double, a visual add-on was released. In update 2.0, dbpk was introduced. To install the new graphics engine, type python3/py dbpk install graphics A simple program to test it is:

IMPORT GRAPHICS
IX XV
CR 40
IY
SX 00
YV
CR 40
XV US
RS