This is a simple interpreter of the esoteric Brainfuck programming language written in C.
(It doesn't seems to work on armv7l and aarch64, works on x86_64).
Compile it:
$ gcc main.c -o bf
Run it with a file with Brainfuck code:
$ ./bf <your file>
$ echo '++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.' > hello.bf
$ ./bf hello.bf
> Hello World!