Re: *INZSR - I still love you!!!

[rob@xxxxxxxxx]

Use of that ITER may cause you to rewrite the way you do loops.  Not 
necessarily a bad thing, just something to keep in mind.  For example, the 
following is an infinite loop:
read myfile;
Dow not %eof(myfile);
  if myfield='IDoNotCare';
    iter;
  EndIf;
  // process normally
  read myfile;
EndDo;

This might become:
Dou %eof(myfile);
  read myfile;
  select;
  When %eof(myfile);
    leave;
  When myfield='IDoNotCare';
    iter;
  EndSl;
  // process normal
EndDo;

Rob Berendt
-- 
"All creatures will make merry... under pain of death."
-Ming the Merciless (Flash Gordon)




Hans Boldt <boldt@xxxxxxxxxx> 
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01/15/2004 09:26 AM
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Re: *INZSR - I still love you!!!






Anton Gombkötö wrote:
> ...
> (And GOTO was forbidden (and i mean it! A guy wrote a program to check
> the source codes for that and for ITER, LEAVE, ...!) long years ago...
> ;-)
> 

Oh dear oh dear oh dear!

Why oh why would you not want to use such nice opcodes as ITER and 
LEAVE? These are perfectly valid ways to repeat or exit a loop, and 
should not be tossed into the same bucket as GOTO. Lots of languages 
have similiar constructs: C, Java, Python and Ruby have "break" and 
"continue", Perl has "last" and "next" (just to name a few other 
commonly used languages). Heck, even many implementation of Pascal, that 
paragon of structured programming virtue, have "break" (or "exit") and 
"continue"!

I think the only people who object to ITER and LEAVE in RPG are those 
who try too hard to follow the "rules" of structured programming. 
Structured programming is fine, but it still shouldn't be allowed to get 
in the way of readable programs. (Just my humble opinion.)

Cheers! Hans


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