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Date: Mon, 7 Dec 92 09:26:28 MST
From: kpopple@imp.sim.es.com (Ken Poppleton)
Message-Id: <9212071626.AA13989@imp>
To: hyperc-l@calvin.sfasu.edu
Subject: Re:C quiz
Status: R

from Basil Johnson

> The problem lies between the 2nd and 3rd jsr 4, printf.  When I
> changed the #define OA_KEY 0xc061 to the explicit declaration unsigned
> OA_KEY = 0xc061; the program worked OK.  So the problem is not with
> the macro.  Here's the code that that version generated and a
> comparison with the first.
  .
  .
  .
> I'm not familiar enough with the opcodes to decipher what's happening.
> However, since one can't do '#define unsigned OA_KEY 0xc061', my guess
> is that either #define does not accept an unsigned integer (what do
> the gurus say) or HyperC is generating incorrect code in this
> instance.  Looks like I am getting 0x7f61 instead of 0xc061.
>  
> So, is this a bug? 


I do not use Hyper-C (YET) but from my use of Unix C I would consider
the following...

As I believe that Hyper-C is a 16 bit system, then the integer 0xc061
is actually a negative integer, if assigned to an unsigned variable
the sign bit may be lost.  The define

	#define OA_KEY 0xc061

defines OA_KEY to the integer (default type) 0xc061 which is -16287.

If you want it to be an unsigned integer, try the define

	#define OA_KEY ((unsigned int)0xc061)

In the second section above, the define attempt of

	#define unsigned OA_KEY 0xc061

does not fit the definition of define from K&R which states

	#define identifer token

where all subsequent instances of the identifier are replaced with the
token.  Or the alternate form of

	#define identifer(param,param,...param) token

performs the substitution of identifer with token and each occurance
of param in token is replaced with the corrisponding param.

I hope this is of some help.
Ken Poppleton
kpopple@imp.sim.es.com