NullScript

NullScript is an esolang I made for fun.

Commands

NullScript has a 4096-cell tape of 16-bit signed integers.

Command	Description
[	Decrement current cell
]	Increment current cell
;	Square or multiply current cell
?	Set the current cell to a pseudorandom number between 0 and ccell - 1.
.	Print the current cell as a number
,	Print the current cell as an ASCII character
"	Take a number as input to the current cell
'	Take a character as input to the current cell
{	Jump left if the current cell is non-zero
}	Jump right if the current cell is zero
:	Makes a label for jumps
=	Compare *cell with *(cell + 1) and put the result in cell + 2
<	Move the cell pointer left
>	Move the cell pointer right
@	Set the current cell to 0
!	Throw a fatal error or exit the REPL
0-9	See Numbers below

Numbers

Literal numbers (0...9) cause some commands to be repeated a certain number of times (nr). The number of times it will be repeated vary on the current nr-value.

The default nr is 1. Multiple digits in a row are handled like this:

Old nr	This nr	Yields
1	0	10
1	1	32
1	[2...9]	d
Not 1	0	97
Not 1	1	1
Not 1	[2...9]	nr * d - 1

nr is reset to 1 after the next command is executed.