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  2. RPG400-L
  3. March 2003

Re: Operation Precedence questions

Dan wrote:
> ...
> 
> <my comments/questions follow>
> 
> If AND & OR are always the lowest precedence, how can the array index example 
> above work?
> According to the rules of precedence, as I interpret them, all of the 
> operands:
>       I<=%ELEM(ARRAY)
>       I>0
>       ARRAY(I)>10
> would be evaluated before the AND relational operators.  If 'I' is zero, I 
> would expect a run-time
> error on the ARRAY(I)>10 because the > operator has a higher precedence than 
> the AND operator.
> 
> BTW, I know from experience that this example works.  I am questioning 
> whether the precedence of
> operations really should be re-arranged to place AND & OR higher in the list.
> 

Dan, in the expression A AND B AND C, there are actually two AND
expressions:
   A AND B
   "value of A AND B" AND C
For the first one, if A is false, B isn't evaluated.  For the second
one, if "value of A AND B" is false, C isn't evaluated.

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