From: david.brown@hesbynett.no   
      
   On 21/11/2022 22:21, Ben Bacarisse wrote:   
   > David Brown  writes:   
   >   
   >> On 21/11/2022 21:45, Ben Bacarisse wrote:   
   >>> I wonder if there are any real posters here?  Let's see...   
   >>> I came across a trivial programming task that must have been solved a   
   >>> thousand times by other programmers, but it had never crossed my path   
   >>> until yesterday.  I must be feeling my age because I made a real hash of   
   >>> tackling it at first.  Anyway, I thought it might be of interest.   
   >>> Consider any ordered measure that "wraps round" -- bearings in degrees,   
   >>> minutes in the hour, indeed hours in either the 12 or 24 hour clock.   
   >>> The problem is to determine if a given value is in the sub-range   
   >>> specified by a start and an en value.   
   >>> I was specifically concerned with integer values where the sub-range   
   >>> includes the start value but excludes the end value.   
   >>> Though I am not sure this merits the term "puzzle", I suggest that   
   >>> solutions be posted with some spoiler protection.  Do all the news   
   >>> readers used by programmers (or ex programmers) all respect the presence   
   >>> of a form-feed character...   
   >>>    
   >>> ... like this?  Because that's my favourite way, rather than posting   
   >>> lots of dummy lines before the solution.   
   >>>   
   >>   
   >> Are there any restrictions, such as sticking to integers?  The problem   
   >> becomes quite difficult if your measure is the reals in [0, 1) and   
   >> your "n" is, say, π/4...   
   >   
   > I don't follow.  What is "my" n?  I did not mention an n.   
   >   
   > I don't see why the problem can't be naturally extended to a circular   
   > real interval [0, 1), subject to the fact that we'll use floating point   
   > numbers for practical purposes.  But I don't think this is what you were   
   > talking about.   
   >   
      
   Having now read Tim's post, I see I might have /completely/   
   misinterpreted what you wrote.  Your "en value" was not a step size "n",   
   but a typo for "end value".  But then your problem comes down to nothing   
   more than a "modulo" function and a comparison, which sounds far too   
   simple a "puzzle".   
      
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