Re: div bug
Re: div bug
- Subject: Re: div bug
- From: Philip Aker <email@hidden>
- Date: Tue, 4 Aug 2009 07:45:49 -0700
On 2009-08-04, at 02:31:52, Paul Berkowitz wrote:
This is normal behaviour. The div operator is used to divide 2
numbers. Applescript converts both numbers to integers (if they're
not already integers), performs the division, and discards any
fractional remainder. The result is always an integer. Use / instead
of div.
Oh, you're perfectly correct !
Am I misreading, or are these answers missing the point?
102.0 div 1 ought to yield 102, not 101.
I think Bert has it right, but you bring up an interesting point with:
102.0 div 1
v.s.
102.0 / 1
v.s.
n as integer --> 102
The result of '/' agrees with the behavior of Tcl, so I think it's
correct. That behavior can be understood as being in accordance with
the C language promotion rules for math operators and it's 'div'
function result form (two integers). Essentially (there are possible
mitigating circumstances), the lower number type will be promoted to
be the same as the higher one before the operation is performed and
the result type be that as well (i.e. int->float/double). But the
'div' function takes two integers as inputs so input reals will be
cast to ints before the calculation. Both the AppleScript 'div' and
'/' results can be seen to be correct in this light.
At first glance it might seem that the C conventions are gonna work
like folks with our "as learned in school" math heritage think they
should. But they don't…
Philip Aker
echo email@hidden@nl | tr a-z@. p-za-o.@
Democracy: Two wolves and a sheep voting on lunch.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
AppleScript-Users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
Archives: http://lists.apple.com/archives/applescript-users
This email sent to email@hidden
| References: | |
| | >Re: div bug (From: Paul Berkowitz <email@hidden>) |