A simple brainf interpreter which can handle nested loops.
Brainf is a imperative, tape-based, one-dimensional turing complete programming language designed by Urban Müller in 1993.
More: https://esolangs.org/wiki/Brainfuck
> increment the data pointer
< decrement the data pointer
+ increment the data at the data pointer
- decrement the data at the data pointer
. output the data at the data pointer
, read input, storing the data at the data pointer
[ if the data at the pointer is zero, instead of moving the instruction pointer forward one, jump it forward to the command after the matching ] command
] if the data at the pointer is nonzero, instead of moving the instruction pointer forward, jump it back to the command after the matching ] command
make
./bf hello.b
++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.
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