COPY WITH @

COPY WITH @ or CW@ is a esolang(made by User:Yayimhere) where you copy values of a stack and increment and decrement them. the stack starts with a 1 on it.

SYNTAX

symbol	description
@	copy top of stack
#	discard top of stack
!	output the top of the stack. does not pop the value
;	output the top of the stack as a ascii char
+	increment top of the stack
-	decrement top of stack
?	take user input and push onto stack
{	jump to corresponding } if the top of the stack is a 0
}	jump to corresponding { if the top of the stack is not 0
↷	put the top of the stack to the bottom

Examples

here are some examples:
truth-machine

?{!}!

and a lot longer one:

-@@+↷↷+{↷{↷↷↷↷+↷↷+↷↷↷-}↷↷↷↷{↷↷+↷↷↷↷-}↷↷{{-}↷↷↷↷#?↷↷↷↷↷↷↷↷+↷↷↷↷↷↷+↷↷↷↷{↷↷{-}↷+↷↷↷↷↷↷-}↷↷↷{↷↷↷↷↷↷+↷↷↷-}↷↷{↷↷↷{-}↷↷{-}
↷↷↷↷↷↷↷↷↷↷↷↷↷↷↷↷{↷↷↷↷↷↷↷↷+↷↷+↷↷↷↷↷↷↷↷↷↷↷↷↷↷-}↷↷↷↷↷↷↷{↷↷↷↷↷↷↷↷↷↷↷↷↷↷+↷↷↷↷↷↷↷-}↷↷{-}}↷↷↷↷↷↷↷↷↷↷↷↷{-}↷↷↷↷↷↷}↷↷↷{↷↷↷↷+↷↷+↷↷
↷-}↷↷↷↷{↷↷+↷↷↷↷-}↷↷{{-}↷↷↷↷{;}}↷↷+↷↷+↷↷{↷↷↷↷-↷↷+↷↷↷-}↷↷↷↷↷↷{↷↷↷+↷↷↷↷↷↷-}↷{-↷↷+↷↷{↷↷↷↷↷↷-↷↷+↷-}↷↷{↷+↷↷-}↷↷↷↷{↷-↷↷
{-}}↷{↷↷↷+↷↷↷↷↷↷-}↷}↷↷↷↷{-}↷↷↷↷{↷↷↷↷+↷↷+↷↷↷-}↷↷↷↷{↷↷+↷↷↷↷-}↷↷{{-}↷↷↷↷;↷↷}↷↷↷{↷↷↷↷+↷↷+↷↷↷-}↷↷↷↷{↷↷+↷↷↷↷-}↷↷{{-
}↷↷↷{-}↷↷{-}↷↷↷↷}↷↷}

Looping counter:

-@@++{------↷↷+↷}↷↷-@;{@:}

Computational class

COPY WITH @ is Turing-complete because it can almost directly implement all the commands of 3-cell brainfuck (at the start of the program it is easy to create a stack of 3(-@@) cells with the value 0, then < can be implemented as ↷ and > can be implemented as ↷↷, with the other commands having direct equivalents as one- or two-command combinations (substitution system)).

External resources

Github repo for an interpreter(the ; command doesn't work for some reason if you can fix it plz do)