Brainfuck is a programming language. And it’s what it says in its name Brainfuck.

Only 8 instructions:

Cmd  Effect
---  ------
+    Increases element under pointer
-    Decrases element under pointer
>    Increases pointer
<    Decreases pointer
[    Starts loop, flag under pointer
]    Indicates end of loop
.    Outputs ASCII code under pointer
,    Reads char and stores ASCII under ptr

Now take a look at the Hello World (You can run it in this JavaScript Interpreter:

+++++ +++++             initialize counter (cell #0) to 10
[                       use loop to set the next four cells to 70/100/30/10
    > +++++ ++              add  7 to cell #1
    > +++++ +++++           add 10 to cell #2
    > +++                   add  3 to cell #3
    > +                     add  1 to cell #4
    <<<< -                  decrement counter (cell #0)
]
> ++ .                  print 'H'
> + .                   print 'e'
+++++ ++ .              print 'l'
.                       print 'l'
+++ .                   print 'o'
> ++ .                  print ' '
<< +++++ +++++ +++++ .  print 'W'
> .                     print 'o'
+++ .                   print 'r'
----- - .               print 'l'
----- --- .             print 'd'
> + .                   print '!'
> .                     print '\n'

Any idea? I’m not smart enough so I have to read the explanation.

Anyway, I decided to try to write one (and it’s the only one, I have ever written) to print out:

*
**
***
****
*****
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