Thomas Morley <[email protected]> writes:
> 2015-08-10 19:02 GMT+02:00 Thomas Morley <[email protected]>:
>> Hi all,
>>
>> I want to put out 3/2 not as 1.5 but "1½" or "1 1/2"
>> Is there a predefined procedure in guile or do I need to define my own?
>>
>> Thanks,
>> Harm
>
> It's a matter of "exactness".
> And when #e comes into the game the guile-manual is not verbose about it.
> To say the least.
>
> In the end I come up with the below. I decided to return a ist, not a string.
>
> But it feels pretty clumsy, noone with something better?
>
>
> (define (integer-and-fraction nmbr)
> "Return a list with an integer and a fraction build from an exact number
> Example: 47/7 -> (6 5/7) "
> (let* ((i (inexact->exact (truncate nmbr)))
> (rest (string->number (format #f "~a~a" "#e" (- nmbr i)))))
> ;; return a string
> ;(format #f "~a~a"
> ; i
> ; (if (= rest 0)
> ; ""
> ; (string-append " " (number->string rest))))
> ;; return a list
> (list i rest)
> ))
Well, how about something like
(define (integer-and-fraction nmbr)
(let* ((wh (truncate nmbr)) (rem (- nmbr wh)))
(if (or (zero? wh) (zero? rem)) (format #f "~s" nmbr)
(format #f "~s ~s" wh (abs rem)))))
(display (integer-and-fraction (/ 1111 7)))
Of course the disadvantage being that you cannot distinguish between one
and two numbers and cannot read the number back in easily.
--
David Kastrup
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