disabling unary "-" for unsigned types
SeeWebsiteForEmail at erdani.org
Tue Feb 16 02:48:22 PST 2010
Walter Bright wrote:
> Lutger wrote:
>> It's a valid viewpoint, but it is a 'should'. I believe many
>> programmers have only passing familiarity if at all with the semantics
>> of unsigned types and floating point operations. At least when coding,
>> they don't have these semantics in mind. Why do you think Java doesn't
>> have unsigned types?
> Naive programmers have trouble with Java floating point as well:
> There's just no getting around it. Should Java just remove floating
> point types as well?
> Heck, I knew a degree'd mechanical engineer who could not understand why
> his calculator kept giving him answers off by a factor of 2 (he refused
> to understand roundoff error, no matter how many times I tried to
> explain it to him - he believed that calculators had mathematically
> perfect arithmetic).
How could he refuse? One of my favorite games with calculators was to
successively extract square root of 2 until I got 1. The better the
calculator, the more steps it takes. That's kind of difficult to refuse
to acknowledge :o).
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