[tor-bugs] #23368 [Core Tor/Tor]: Add design and coding guidelines for using floating point

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#23368: Add design and coding guidelines for using floating point
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 Reporter:  teor             |          Owner:  (none)
     Type:  enhancement      |         Status:  needs_review
 Priority:  Medium           |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/Tor     |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  doc, tor-safety  |  Actual Points:
Parent ID:                   |         Points:  0.5
 Reviewer:                   |        Sponsor:
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Comment (by teor):

 4. Try to do as many of your calculations in integer precision as
 possible, and convert to floating point for display or transfer.

 It might also help to link to a general list of do's and don't's, like:
 * don't compare floating-point numbers using equals (comparing with 0.0 is
 an exception)
 * always check for division by zero, even if the inputs to a function are
 non-zero, the result can round to zero

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/23368#comment:2>
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