Brainfuck Playground

Brainfuck is an esoteric programming language created in 1993 by Urban Müller. It operates on a simple model: an array of memory cells and a data pointer.

Basic Commands

Command	Description
>	Move the data pointer to the right
<	Move the data pointer to the left
+	Increment the memory cell at the data pointer
-	Decrement the memory cell at the data pointer
.	Output the character at the data pointer
,	Input a character and store it at the data pointer
[	Jump past the matching ] if the cell at the data pointer is 0
]	Jump back to the matching [ if the cell at the data pointer is not 0

Example Programs

Hello World

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

Simple Addition (2 + 3)

++       Cell 0 = 2
>+++     Cell 1 = 3
[<+>-]   Add cell 1 to cell 0
<        Move back to cell 0
++++++++++++++++++++++++++++++++++++++++++++++++.  Add 48 and output (to get ASCII '5')

Echo Program

,[.,]    Read input and echo it back until EOF

Multiply 3 x 4

+++        Cell 0 = 3
>++++      Cell 1 = 4
[          Start loop
  <+++>    Add 3 to cell 0 for each iteration
  -        Decrement cell 1
]          End loop when cell 1 is 0
<          Move to cell 0
++++++++++++++++++++++++++++++++++++++++++++++++.  Add 48 and output result

Tips

• Memory cells are initialized to 0
• The data pointer starts at position 0
• Each cell can hold values 0-255 (wraps around)
• Use loops [] for repetitive operations
• ASCII values: 'A' = 65, 'a' = 97, '0' = 48, space = 32
• To output numbers, add 48 to convert to ASCII

How to Use

• Ctrl+Enter (or Cmd+Enter): Run code
• When a program needs input, type in the output area and press Enter
• Input is processed one character at a time