Re: scheme math

Hi,

just use the right one:

#;3> (define (F->C fahr) (inexact->exact (truncate (* 0.5556 (- fahr 32)))))
#;4> (F->C 29)
-1


Cheers,
Dominik

On 12/2/25 21:04, Duke Normandin via Chicken-users wrote:
> On Tue, 02 Dec 2025 20:59:31 +0100
> Mario Domenech Goulart <[email protected]> wrote:
> 
>> Hi,
>>
>> On Tue, 2 Dec 2025 12:16:11 -0700 Duke Normandin via
>> Chicken-users <[email protected]> wrote:
>>
>>> I have a function that sometimes returns a negative real number,
>>> like "-2.0" or "-2.65"
>>> For both negative and positive returned numbers, I want to
>>> remove the decimal portion and return only the quotient and the
>>> sign.
>>>
>>> I've tried `floor", 'flonum->inexact", and the list goes on, but
>>> with no success.
>>>
>>> I'm NOT a mathematician or even very strong in arithmetic. LOL
>>> So I'm asking for a possible solution. TIA ...
>>
>> You can use something like (inexact->exact (round the-number)).
> 
> Thx Mario ...
> 
>> (define (F->C fahr)
>      (exact->inexact (round (* 0.5556 (- fahr 32)))))
>> (F->C 29)
> -2.0
>