RE: Bitwise ops in RPG (was: Re: Determining *DS4 support)

I prefer the BIF format.  And I would like the %BITXOR *IMMED!  :-)

The prefix of %BIT is clear and unambiguous and just seems much easier to
read to my eyes.

Just one pgmr's vote!

Tom Westdorp
AS/400 Senior Programmer/Analyst 
  
IBM Certified Specialist - RPG IV Programmer
IBM Certified Specialist - RPG IV Developer 
Certified Master RPG IV Programmer 
Internal Telephone # 04-6859
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tom.westdorp@stationcasinos.com 



-----Original Message-----
From: boldt@ca.ibm.com [mailto:boldt@ca.ibm.com]
Sent: Tuesday, November 14, 2000 11:19 AM
To: rpg400-l@midrange.com
Subject: Bitwise ops in RPG (was: Re: Determining *DS4 support)



Jim wrote:
>If you do create a bitwise AND please do not make the token 'AND' but
>some other symbols, perhaps C's '&&'.  It gets very confusing when AND
>is both bitwise and logical.  Code that looks like it should work either
>doesn't or is intermittent, but it still compiles with AND as both bitwise
>and logical.  Especially if you allow IF statements to become true on
>non *zero values.  That's my biggest complaint with Basic.

But of course!  AND and OR should only ever refer to the logical
operations.  Otherwise, severe ambiguities would result.

This begs the question:  What syntax would you prefer for bitwise
operations?

a) infix operators:
      x ANDB y
      x ORB y
      x XORB y
      NOTB y

   (&& and || (like in C) are problematical for us since '|' is
   not in the invariant EBCDIC code page.)

b) built-in functions:
      %BITAND(x:y)
      %BITOR(x:y)
      %BITXOR(x:y)
      %BITNOT(x)

Cheers!  Hans

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com

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