Re: [Jscheme-user] inexact->exact

[Timothy J H. <tjh...@br...>]

On Oct 20, 2005, at 5:28 AM, gk...@su... wrote:
> =EF=BB=BF(inexact->exact 7.4323)
> $1 =3D 7
>
> Is this correct?
In JScheme we have not implemented rational numbers so the only exact=20
numbers we have are integers.
Thus, this is the best we can do for the inexact->exact procedure.

If you want rationals you can import the SISC number system by putting=20=

the sisc.jar file in the classpath
and using
    (load "using/siscnum.scm")
It would be a good idea to extend siscnum.scm to provide the correct=20
definition for inexact->exact and
exact->inexact, but we haven't done that yet.... Indeed we get the=20
following behavior
>
> [Timothy-Hickeys-Computer:clip/clip/smath] tim% java -cp=20
> jscheme.jar:sisc.jar jscheme.REPL
> JScheme 7.1 (8/3/04 10:50 PM) http://jscheme.sourceforge.net
> > (load "using/siscnum.scm")
> #t
> > (q "1/5")
> 1/5
> > (* (q "3/14") (q "7/81"))
> 1/54
> > (inexact->exact 1.1)
> 1
> > (exact->inexact (q "1/3"))
>
> (exact->inexact (q "1/3" ))
>
>   =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> SchemeException: expected object of type real number, but got: , "1/3"
> > (.getClass (q "1/5"))
> class sisc.data.Quantity
> >

Best,
---Tim---




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