From: Pit Capitain <pit@...>
Date: 2006-08-16T05:57:24+09:00
Subject: Re: problem with date.succ

Russ Pridemore schrieb:
> I'm having difficulty with a small program I'm writing dealing with
> dates.  I've written the calendar class below.  It works just fine
> when calling getMonth for all months EXCEPT NOVEMBER.  Interrupting
> the call while in irb shows that it is busy in the reduce method of
> Rational, called from Date.  Any ideas?
> 
> (...)
> 
>   def getMonth(mo)
>      dt = Date.new(@year, mo, 1)
>      i = dt.month
>      list = Array.new
>      while i != (mo+1) % 12
>         wk = getWeek(dt.month, dt.day)
>         dt = wk[6].succ
>         i = dt.month
>         list.push(wk)
>      end
>      list
>   end
> 
> (...)

Russ, for November, "mo" is 11, and "(mo+1) % 12" is zero, but 
"dt.month" and "i" are always in the range (1..12), so you've got an 
endless loop. Replace the line

   while i != (mo+1) % 12

with

   next_month = mo % 12 + 1
   while i != next_month

and at least the loop should work as you expect.

Regards,
Pit