Vars

Vars is a simple esolang where varibles are defined by a number which by default is zero

(Note: numbers cannot be used in the code and variable number 0 is treated as empty (so you can access it (#())))

Commands:

#(x) varible number x
+(x) add one to variable number x
-(x) subtract one from varible number x
[x:code] while variable number x is not 0 run code
?(code) 50% chance of running code
$(x) print variable number x
%(x) set variable number x to input

Programs

Truth-machine

%()[:$()]$()

Cat program

+()[:%()$()+()]