From: <dsmich@roadrunner.com>
To: guile-user@gnu.org, Lawrence Bottorff <borgauf@gmail.com>
Subject: Re: Simulating rational number addition/subtraction
Date: Wed, 24 Feb 2016 18:32:12 -0500 [thread overview]
Message-ID: <20160224233212.D0GOI.246997.root@cdptpa-web08> (raw)
In-Reply-To: <CAFAhFSXeLgX73qZrF5ns1wkRHZZZ3sjsNKSBOXKWcTsXxn+hag@mail.gmail.com>
---- Lawrence Bottorff <borgauf@gmail.com> wrote:
> With guile (and a few other Schemes/Lisps) you can directly add fractions
> or rational numbers:
>
> (+ 1/2 1/12)
> => 7/12
>
> It's like magic, no? Anyway, I'm trying -- for educational purposes -- to
> reproduce this functionality. But right out of the blocks I'm stuck trying
> to figure out how to handle incoming parameters. So far I've got
>
> (define (myrat a b)
> . . .)
>
> (define (myrat a b c d)
> . . .)
>
> where numerator and denominator are given separately, as well as
>
> (define (myrat . fracparams)
> . . .)
>
> which still has my basic problem, namely, can one parameter hold both parts
> of a rational number, then allow the numerator and denominator to be peeled
> off and worked on, i.e., something like
>
> (let ((num1 numepeeler(a))
> (denom1 denompeeler(a)
>
>
> LB
This https://mitpress.mit.edu/sicp/full-text/book/book-Z-H-14.html might be enlightening....
-Dale
next prev parent reply other threads:[~2016-02-24 23:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-24 22:27 Simulating rational number addition/subtraction Lawrence Bottorff
2016-02-24 23:32 ` dsmich [this message]
2016-02-25 7:07 ` tomas
2016-02-26 13:01 ` Alex Vong
2016-02-25 6:52 ` Jan Wedekind
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