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make explanation richer

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JongChan Choi 2013-09-21 05:01:47 +09:00
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@ -67,8 +67,10 @@ 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. In that case,
inner loop won't work anymore since next time. 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.
Then cell #3 is the result.
``` ```
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