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2015-02-06T04:57:02Z footer: while reading sicp should I be bother if I couldn't remember sth like gcd algo?
2015-02-06T04:57:17Z footer: Or the essense of book is to learn how to make abstractions?
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2015-02-06T04:57:53Z pjb: the later.
2015-02-06T04:58:03Z pjb: you can lookup gcd in wikipedia or google.
2015-02-06T04:58:30Z footer: pjb: right, but should do each and every excercise?
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2015-02-06T04:58:43Z pjb: If you have the time to do them all, yes.
2015-02-06T04:58:51Z pjb: They all teach something.
2015-02-06T04:59:08Z footer: Yep, I am still confused about procedure  and process
2015-02-06T04:59:20Z footer: if procedure is recursive, the process might be iterative?
2015-02-06T04:59:47Z footer: in other language what we call recursive function can have iterative process?
2015-02-06T05:01:03Z footer: pjb: ^
2015-02-06T05:02:08Z footer: pjb: also I am studying first chapter atm, will it also teach me data structures like tree etc?
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2015-02-06T05:13:46Z pjb: footer: that's because the recursion can be a tail recursion, and therefore tail call optimization may remove it, leaving an iterative process: the tail call is replaced by a jump to the beginning of the procedure, instead of new call.
2015-02-06T05:14:29Z pjb: sicp is not too heavy with data structures, but it covers them generally with data abstractions and functional abstractions.
2015-02-06T05:14:53Z footer: pjb: okay now I get it. So I could say if some procedure calls itself it is recursive procedure and it might not be recursive process
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2015-02-06T05:18:20Z pjb: Yes.
2015-02-06T05:18:43Z pjb: The question is whether the recursive calls are terminal or not.
2015-02-06T05:19:04Z footer: sorry?
2015-02-06T05:19:08Z footer: can you please elaborate?
2015-02-06T05:19:45Z pjb: (define (f x) (if (< x 0) (display "*") (f (- x 1))) (display "|"))  here, (f (- x 1)) is not a terminal call. Therefore we cannot perform tail call optimization, and we have a recursive process.
2015-02-06T05:20:22Z pjb: (define (g x) (display "|") (if (< x 0) (display "*") (g (- x 1))))  here, (g (- x 1)) is a terminal call, so it can be optimized and g made into an iterative process.
2015-02-06T05:20:46Z footer: hmm, got it
2015-02-06T05:21:03Z footer: thanks pjb
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2015-02-06T06:35:46Z footer: pjb: still there?
2015-02-06T06:36:41Z footer: pjb: when you said sicp doesn't teach data structures but does it have data-structures till the level of b-tree etc?
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