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  2. RPG400-L
  3. March 2003

Re: Operation Precedence questions

Gord Royle wrote:

Take it from someone who went Ga-Ga in School over Boolean Math -
Parentheses change everything. Try A and B or C and D versus (A and B) or (C
and D). Stuff in Parenthesis is always evaluated first. I tend to use lots
of them 'cause I'm still confused by AND/OR precidence and get even more
confused when you throw in a NOT. Consider A or B and C or NOT D. <Hair
starts to come out>.

I'm with you. I almost always put parentheses in. In fact, the only time I don't put parentheses is when there is only a single condition type, i.e.,

                A and B and C
                A or B or C

as soon as there is a mix, I paren it to death like this

                A and (B or C)
                (A and B) or C

I don't even try to remember what operator is evaluated first. Same with numeric expressions. I _never_ leave it to my memory.

--
Jeff Crosby
Dilgard Frozen Foods, Inc.
P.O. Box 13369
Ft. Wayne, IN 46868-3369
260-422-7531

The opinions expressed are my own and not necessarily
the opinion of my company.  Unless I say so.




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