RE: Operation Precedence questions

["Tracy Ball" <TBall@xxxxxxxxxxxxxxxx>]

I think what you are missing is that *and and *or are conditions.   The *and 
merely separates expressions, yet is like a stepping stone to the next step.   
If  A and B and (C and D), there is no reason to care what (C and D) equals 
unless (A and B) is true.

-Tracy 
 Ext. 3107


-----Original Message-----
From: Dan [mailto:dbcerpg@xxxxxxxxx]
Sent: Thursday, March 20, 2003 3:35 PM
To: RPG programming on the AS400 / iSeries
Subject: Re: Operation Precedence questions


--- Douglas Handy <dhandy1@xxxxxxxxxxxxx> wrote:
> Dan,
> 
> >What if your example were thus:
> >    A AND B AND X < 10
> 
> That becomes the equivalent of 
> 
>   A and B and ( X < 10 )
> 
> Thus we are now reduced to only have AND clauses, which are short-circuit
> evalutated from left to right.  So unless both A and B are true, it never has 
> to
> evaluate ( X < 10 ).
> 
> See?
> 
> Doug

Unfortunately, no, I don't.  As I see it, the parentheses surrounding X < 10 
*guarantees* that it
will be evaluated before the ANDs are tested.  Again, pointing to the 
Precedence of Operations:

The following list indicates the precedence of operations from highest to 
lowest:
  1. ()
  2. Built-in functions, user-defined functions
  3. unary +, unary -, NOT
  4. **
  5. *, /
  6. binary +, binary -
  7. =, <>, >, >=, <, <=
  8. AND
  9. OR

Based on how everyone has responded to me thus far, it seems the precedence of 
operations should
be:
  1. AND
  2. OR
  3. ()
  4. Built-in functions, user-defined functions
  5. unary +, unary -, NOT
  6. **
  7. *, /
  8. binary +, binary -
  9. =, <>, >, >=, <, <=

Again, what am I missing?


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