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Merge pull request #303 from mathiasbynens/patch-1

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brainfuck: A few corrections
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Adam Bard 2013-09-04 09:13:26 -07:00
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@ -1,11 +1,12 @@
---
language: brainfuck
contributors:
- ["Prajit Ramachandran", "http://prajitr.github.io"]
- ["Prajit Ramachandran", "http://prajitr.github.io/"]
- ["Mathias Bynens", "http://mathiasbynens.be/"]
---
Brainfuck is an extremely minimal programming language (just 8 commands) and
is Turing complete.
Brainfuck (not capitalized except at the start of a sentence) is an extremely
minimal Turing-complete programming language with just 8 commands.
```
Any character not "><+-.,[]" (excluding quotation marks) is ignored.
@ -27,7 +28,7 @@ There are eight commands:
[ and ] form a while loop. Obviously, they must be balanced.
Let's look at some basic Brainfuck programs.
Let's look at some basic brainfuck programs.
++++++ [ > ++++++++++ < - ] > +++++ .
@ -45,21 +46,18 @@ print cell #2's value. 65 is 'A' in ASCII, so 'A' is printed to the terminal.
, [ > + < - ] > .
This program reads a character from the user input, copies the character into
another cell, and prints out the same character.
, reads in a character from the user into cell #1. Then we start a loop. Move
to cell #2, increment the value at cell #2, move back to cell #1, and decrement
the value at cell #1. This continues on until cell #1 is 0, and cell #2 holds
cell #1's old value. Because we're on cell #1 at the end of the loop, move to
cell #2, and then print out the value in ASCII.
This program reads a character from the user input and copies the character into
cell #1. Then we start a loop. Move to cell #2, increment the value at cell #2,
move back to cell #1, and decrement the value at cell #1. This continues on
until cell #1 is 0, and cell #2 holds cell #1's old value. Because we're on
cell #1 at the end of the loop, move to cell #2, and then print out the value
in ASCII.
Also keep in mind that the spaces are purely for readibility purposes. You
could just as easily write it as
could just as easily write it as:
,[>+<-]>.
Try and figure out what this program does:
,>,< [ > [ >+ >+ << -] >> [- << + >>] <<< -] >>
@ -73,7 +71,7 @@ problem: at the end of the inner loop, cell #2 is zero. To solve this problem,
we also increment cell #4, and then recopy cell #4 into cell #2.
```
And that's Brainfuck. Not that hard, eh? For fun, you can write your own
Brainfuck programs, or you can write a Brainfuck interpreter in another
And that's brainfuck. Not that hard, eh? For fun, you can write your own
brainfuck programs, or you can write a brainfuck interpreter in another
language. The interpreter is fairly simple to implement, but if you're a
masochist, trying writing a Brainfuck interpreter... in Brainfuck.
masochist, try writing a brainfuck interpreter… in brainfuck.