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<article>
<h2>Brainfuck mode</h2>
<form><textarea id="code" name="code">
[ This program prints "Hello World!" and a newline to the screen, its
  length is 106 active command characters [it is not the shortest.]

  This loop is a "comment loop", it's a simple way of adding a comment
  to a BF program such that you don't have to worry about any command
  characters. Any ".", ",", "+", "-", "&lt;" and "&gt;" characters are simply
  ignored, the "[" and "]" characters just have to be balanced.
]
+++++ +++               Set Cell #0 to 8
[
    &gt;++++               Add 4 to Cell #1; this will always set Cell #1 to 4
    [                   as the cell will be cleared by the loop
        &gt;++             Add 2 to Cell #2
        &gt;+++            Add 3 to Cell #3
        &gt;+++            Add 3 to Cell #4
        &gt;+              Add 1 to Cell #5
        &lt;&lt;&lt;&lt;-           Decrement the loop counter in Cell #1
    ]                   Loop till Cell #1 is zero; number of iterations is 4
    &gt;+                  Add 1 to Cell #2
    &gt;+                  Add 1 to Cell #3
    &gt;-                  Subtract 1 from Cell #4
    &gt;&gt;+                 Add 1 to Cell #6
    [&lt;]                 Move back to the first zero cell you find; this will
                        be Cell #1 which was cleared by the previous loop
    &lt;-                  Decrement the loop Counter in Cell #0
]                       Loop till Cell #0 is zero; number of iterations is 8

The result of this is:
Cell No :   0   1   2   3   4   5   6
Contents:   0   0  72 104  88  32   8