5 Jul
2003
5 Jul
'03
3:24 p.m.
On 2003-07-05 at 19:43+0200 Steffen Mazanek wrote:
Hello,
a quit funny hugs session:
Prelude> 0.5::Rational 1 % 2 Prelude> 0.1::Rational 13421773 % 134217728 Prelude> 13421773/134217728 0.1
I do not know how this fraction is calculated, but it does not fit my expectations :-)
Remember that internally arithmetic is binary, and that 0.1 can't be expressed exactly as a floating point number. I think that's the explanation.
Ok, ok, it is no bug...
No, I think it is a bug: 0.1 ought to be equivalent to fromRational (1%10), but Hugs isn't intended for numerical work. GHCi gets the right answer. Jón -- Jón Fairbairn Jon.Fairbairn@cl.cam.ac.uk