Rustration

A simple Brainfuck interpreter in Rust

++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.

What is Brainfuck?

Brainfuck is an esoteric programming language invented by Urban Muller in 1993. The language operates on an array of memory cells, also called a tape. Every cell is intialized to 0. There is a pointer that intially points to the first memory cell, and several commands are used to manipulate the pointer and the data on the tape. The set of commands are >, <, +, -, [, ], ., and ,.

< and > move the data pointer left and right respectively. + and - increment and decrement the data in the cell being pointed at. [ and ] act as a looping mechanism for the language. A [ command means jump past the matching ] if the cell under the data pointer is 0. A ] command means jump back to the matching [ if the cell under the data pointer is not 0. This looping construct is similar to a while loop in a C-like language. A C representation would be something like:

while *data != 0 {

}

The , and . commands act as input and output respectively. , inputs a character and stores it at the data pointer, . outputs the character under the data pointer.

All other characters are considered comments and are ignored.