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1.3 KiB
1.3 KiB
brain_fuck
Instructions
Write a Brainfuck interpreter program.
The source code will be given as first parameter.
The code will always be valid, with less than 4096 operations.
Brainfuck is a minimalist language. It consists of an array of bytes (in this exercice 2048 bytes) all initialized with zero, and with a pointer to its first byte.
Every operator consists of a single character :
- '>' increment the pointer
- '<' decrement the pointer
- '+' increment the pointed byte
- '-' decrement the pointed byte
- '.' print the pointed byte on standard output
- '[' go to the matching ']' if the pointed byte is 0 (loop start)
- ']' go to the matching '[' if the pointed byte is not 0 (loop end)
Any other character is a comment.
For receiving arguments from the command line you should use something like:
fn main() {
let args: Vec<String> = std::env::args().collect();
brain_fuck(&args[1]);
}
Usage
$ cargo run "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>."
Hello World!
$ cargo run "+++++[>++++[>++++H>+++++i<<-]>>>++\n<<<<-]>>--------.>+++++.>."
Hi
$ cargo run "++++++++++[>++++++++++>++++++++++>++++++++++<<<-]>---.>--.>-.>++++++++++."
abc