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fix typo

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JongChan Choi
2013-09-21 04:17:53 +09:00
parent 7aa69ae3d7
commit d3c5a72399
1 changed files with 5 additions and 5 deletions
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@@ -53,25 +53,25 @@ 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 cell #1 at the end of the loop, move to cell #2, and then print out the value
in ASCII. in ASCII.
Also keep in mind that the spaces are purely for readibility purposes. You Also keep in mind that the spaces are purely for readability purposes. You
could just as easily write it as: could just as easily write it as:
,[>+<-]>. ,[>+<-]>.
Try and figure out what this program does: Try and figure out what this program does:
,>,< [ > [ >+ >+ << -] >> [- << + >>] <<< -] >> ,>,< [ > [ >+ >+ << -] >> [- << + >>] <<< -] >>
This program takes two numbers for input, and multiplies them. This program takes two numbers for input, and multiplies them.
The gist is it first reads in two inputs. Then it starts the outer loop, The gist is it first reads in two inputs. Then it starts the outer loop,
conditioned on cell #1. Then it moves to cell #2, and starts the inner conditioned on cell #1. Then it moves to cell #2, and starts the inner
loop conditioned on cell #2, incrementing cell #3. However, there comes a loop conditioned on cell #2, incrementing cell #3. However, there comes a
problem: at the end of the inner loop, cell #2 is zero. To solve this problem, 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. 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 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 brainfuck programs, or you can write a brainfuck interpreter in another
language. The interpreter is fairly simple to implement, but if you're a language. The interpreter is fairly simple to implement, but if you're a
masochist, try writing a brainfuck interpreter… in brainfuck. masochist, try writing a brainfuck interpreter… in brainfuck.