RE: About integers
RE: About integers
- Subject: RE: About integers
- From: "Francois Houle" <email@hidden>
- Date: Wed, 2 Mar 2005 10:54:49 -0500
- Thread-topic: About integers
Basically what I want ot do is this:
set Dialog_1 to display dialog "The application requires your administrative password to run: " default answer ""
set admin_user to the text returned of the result
Now what I would like to do is to have admin_user become a 32 bit unsigned integer that then gets writen properly to a basic text file.
-----Original Message-----
From: applescript-users-bounces+francois.houle=email@hidden [mailto:applescript-users-bounces+francois.houle=email@hidden] On Behalf Of Christopher Nebel
Sent: Tuesday, March 01, 2005 2:43 PM
To: AppleScript Users
Subject: Re: About integers
On Mar 1, 2005, at 11:19 AM, Doug McNutt wrote:
> At 11:10 -0500 3/1/05, francois.houle wrote:
>
>> I was told that it should be possible to use applescript to add 32
>> bit unsigned integers to a text file
>
> From the AppleScript Language Guide:
>
>> The largest value that can be expressed as an integer in AppleScript
>> is ±536870909, which is equal to ±(2^29- 3). Larger integers
>> (positive or negative) are converted to real numbers (expressed in
>> exponential notation) when scripts are compiled.
>
> What the extra three bits are used for remains a mystery but adding
> (in the arithmetic sense) 32 bit integers is likely to result in an
> unexpected 64 bit floating point result.
Regardless, it should work with "write ... as [unsigned] integer", assuming the number is in the appropriate range for the type. You're relying on Apple Event Manager coercions at that point.
Two asides:
1. The ASLG is slightly wrong; the precise range is +2^29-1 ... -2^29.
In other words, a 30-bit twos-complement signed integer.
2. The "missing" bits are used for a typed-pointer scheme in the implementation. It's a common trick in LISP implementations and other allocation-heavy environments.
--Chris Nebel
AppleScript Engineering
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