RE: Operation Precedence questions

[Joel Fritz <JFritz@xxxxxxxxxxxxxxxx>]

The compiler knows the operator precedence rules. It has to. Parentheses are
a crutch I rely on to make sure my logical statements mean what I want them
to mean and maybe make them human readable.  

Back when I took C, my instructor was a programmer who taught night classes
because he needed no sleep.  The one thing he let us bring to tests was an
operator precedence chart.  I took that to mean that he didn't think it was
reasonable to expect people to have it memorized.  BTW, in the early parts
of the course, he included insanely convoluted expressions on the tests that
required either having the chart memorized or having a copy with you. I
asked him if I would ever see things like that in real world code.  He
smiled and said "Yes."<g>  Thank heaven RPG doesn't have a dereferencing
operator or prefix/postfix operators.  

> -----Original Message-----
> From: Tracy Ball [mailto:TBall@xxxxxxxxxxxxxxxx]
> Sent: Thursday, March 20, 2003 12:37 PM
> To: RPG programming on the AS400 / iSeries
> Subject: RE: Operation Precedence questions
> 
> 
> The compiler isn't a math textbook.   If it were (A and B) or 
> A and B or (C and D) then the parenthesis would come into 
> play.  If it is just straight *and statements, as soon as one 
> is false there would be no need to check what is in 
> parenthesis.  Parenthesis on the other hand, greatly enhance 
> the readability of a program and enhance a programmer's 
> understanding of what is happening. However, that doesn't 
> mean the compiler needs them.
> 
> Tracy L. Ball
> The Jackson Group
> Sr. Programmer/Analyst 
> (317) 781-4600 ext. 3107
> 
> 
> 
> -----Original Message-----
> From: Gord Royle [mailto:GRoyle@xxxxxxxx]
> Sent: Thursday, March 20, 2003 3:09 PM
> To: 'RPG programming on the AS400 / iSeries'
> Subject: RE: Operation Precedence questions
> 
> 
> 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>.
> 
> Gord
> 
> -----Original Message-----
> From: Dan [mailto:dbcerpg@xxxxxxxxx]
> Sent: Thursday, March 20, 2003 2:53 PM
> To: RPG programming on the AS400 / iSeries
> Subject: RE: Operation Precedence questions
> 
> 
> --- Booth Martin <Booth@xxxxxxxxxxxx> wrote:
> > Isn't the rule really: "Do from the inside out, starting on 
> the left." ? 
> 
> If it is, I didn't see it in that chapter!  Doesn't that rule apply to
> expressions inside
> parentheses?
> 
> - Dan
> 
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