[m-dev.] ICFP Contest: progress in plan.m

[Ralph Becket]

I've just tracked down a bug that was causing atan2 to fail.
div wasn't working (I was using Michael's long long approach.)
I have no idea why.  But changing to using floats instead
worked like a charm!

Here's the code for dv:

div(fixed(X), fixed(Y)) = fixed(floor_to_int((65536.0 * float(X)) / float(Y))).

-- Ralph
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