Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!tank!gft_robert@gsbacd.uchicago.edu
From: gft_robert@gsbacd.uchicago.edu
Newsgroups: comp.sys.mac.programmer
Subject: Casting Integer to SignedByte in THINK Pascal
Message-ID: <5728@tank.uchicago.edu>
Date: 9 Oct 89 19:14:34 GMT
Sender: news@tank.uchicago.edu
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Organization: University of Chicago Graduate School of Business
Lines: 31

Here's a really simple problem that's bugging me:

I want to write out an integer to a specific location in memory, something like
this:

var
	myPtr:Ptr;
	myInt:integer;

begin
     	myPtr:=some location in memory;
	myInt:= some value <=32k;
	myPtr^:=SignedByte(myInt);
end;


OK, so far so good.  My compiler (THINK Pascal) doesn't choke on this, so it
would seem to be OK.  But it still doesn't choke on it if I make myInt > 255. 
Since SignedByte is defined in IM as 0..255, it shouldn't let me do that (range
checking is turned on), and if I do do it, won't I be overwriting two bytes in
memory, not one?

Your elucidations and explanations gratefully awaited,

Robert

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