Re: Two reade loops: which one preferred ?

I like style 1 because that's how I learned to do loops...by first
creating a Warnier-Orr diagram and then putting it to code. The other
reason I like it is that I don't use a (essentially) a goto. I believe
the compiler actually will implement style 2 even if you code the high
level language using style 1.

On Fri, 21 Nov 2003 05:58:13 +0100, "afvaiv" <afvaiv@xxxxxxxxxx> said:
> Two different but functionally equivalent ?read equal? loops follow.
> 
>  From many of the answers to other posts read thru this list, Style#1 
> seems to be the ?preferred? one for most people.
> But, IN MY OPINION, the second one should be more ?appropiate? from RPG 
> way of thinking...
> 
> C and PASCAL have a ?before_read EOF detection?, whereas RPG and COBOL 
> have a ?after_read EOF detection?, thus :
> 
> - C/PASCAL loops were usually coded as
> while NOT EOF(file)
> do
> read file
> ... process ...
> enddo
> 
> - whereas RPG/COBOL loops used to be coded as , the
> do ?forever?
> read file
> at EOF(file) leave
> ... process ...
> enddo
> 
> So, applying the C/PASCAL approach to RPG forces to include one 
> additional ?read? before the loop as in Style#1.
> 
> Just for curiosity, some people will code it the #2 way, but WHY do MOST 
> people seem to prefer #1 ?
> 
> ----- Style #1 -------------------------------------------
> mykey setll record
> if %equal
> mykey reade record
> dow not %eof
> ... process ...
> mykey reade record
> enddo
> endif
> 
> ----- Style #2 -------------------------------------------
> 
> mykey setll record
> if %equal
> do *HIVAL
> mykey reade record
> if %eof leave
> ... process ...
> enddo
> endif
> 
> -- 
> Antonio Fernandez-Vicenti
> afvaiv@xxxxxxxxxx
> 
> 
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-- 
  
  michaelr_41@xxxxxxxxxxxxxx

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