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BFStack
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BFStack is an esoteric brainfuck derivative. It is stack based instead. The instructions are almost the same, but changed to be stack based.
Instructions
>pushes 0 onto the stack<pops the top of the stack.prints top of stack as ASCII,pushes ASCII input to top of stack+increments the top of the stack-decrements the top of the stack[jumps to the corresponding]if the top of the stack is 0]jumps to corresponding[if the top of the stack isn't 0
Computational class
This is a Push-down automaton, as it would be equivalent to brainfuck, except for it cannot access the non top-of-stack cells.