integers and floating points
Wed, 27 Oct 1999 09:47:21 -0700
> From: Laurent Martelli [mailto:email@example.com]
> Subject: Re: integers and floating points
> >>>>> "JS" == shapj <firstname.lastname@example.org> writes:
> JS> Let's not be so open and high level that we allow ourselves to
> JS> ignore mathematical realities. Integers and floating point
> JS> numbers have deeply different mathematical properties, and in
> JS> the end a high-level system is no good unless it generates the
> JS> results the user wants to see.
> Yes, but the set of integers is a subset of the reals, so they are not
> so different. That's why we exepect to be able to add an integer and a
Don't expect that anymore; it's wrong. The set of integers is not a subset
of the floats; there are integers which cannot be represented as floats.
(x+y)-x is not always equal to x+(y-x) in floating point math. It's always
true for integers.
> Laurent Martelli