Question 1

What is Brainfuck?

Accepted Answer

Brainfuck is an esoteric programming language created in 1993 with only 8 commands: > < + - . , [ ]. Despite its tiny instruction set it is Turing complete — any computable function can be written in it. It is famous as a minimalist language for code golf and programming puzzles.

Question 2

What do the 8 Brainfuck commands do?

Accepted Answer

> moves the pointer right, < moves it left, + increments the current cell, - decrements it, . outputs the current cell as a character, , reads one byte of input into the cell, [ jumps past the matching ] if the cell is zero, and ] jumps back to the matching [ if the cell is non-zero.

Question 3

How big is the memory tape?

Accepted Answer

This interpreter uses a tape of 30,000 unsigned 8-bit cells (values 0 to 255, wrapping around), matching the original Brainfuck specification. The pointer starts at cell 0 and all cells begin at 0.

Question 4

Can I debug step by step?

Accepted Answer

Yes. Use the Step button to execute one command at a time and watch the memory tape, pointer and output update live. You can also set an instruction limit to prevent infinite loops from freezing your browser.