Re: DOW vs DOU - Solution to Challenge

John Carr wrote:

>Here's your assignment if you chose to accept it, Convert the following 
>code of that infamous DOU connoisseur guy  John Carr to a DOW.  
>Your score will be judged on Clarity, Brevity, and Succinctness. 
>To be especially harsh you cannot code the same IF statement 
>twice(But then, why should you need to?).
>
No problem John:

  KEY      CHAIN  FILEXXX              90....
  *IN90    DOWNE  *ON
  XXXCODE  ANDNE  'B'

  XXXCODE  CASNE 'A'         @@PROC     
           ENDCS
 
  KEY      READE  FILEXXX              ....90
           ENDDO

  @@PROC   BEGSR
 < ... end of in-line edits ...>

 <.... whatever process ....>
           ENDSR

It takes less code (9 lines versus 13 lines), is easier to read, and does
not require the redundant indicator test *IN90 IFEQ *ON/LEAVE/ENDDO at the
start of the loop.  Nor does it require an implied GOTO with a LEAVE or ITER
which refers to an ENDDO which might be found after an intense and
frustrating search many pages later in the code.  It also separates the
logic unrelated to the loop processing into a separate subroutine.

Moreover, in your sample, if you use Indicator 90 inside your DOU loop, the
loop fails.  When you use a primed read loop, the indicator used on the DOW
or DOU can be used within the loop without a problem since it is always
reset immediately before the ENDDO.

You owe me a drink at CUDS.

Original code sample was as follows:

>  KEY      SETLL  FILEXXX
>  *IN90    DOUEQ  *ON
>  KEY      READE   FILEXXX                 90
>  *IN90    IFEQ   *ON
>           LEAVE
>           ENDIF
>
>  XXXCODE  IFEQ    'B'
>           LEAVE
>           ENDIF
>
>  XXXCODE  IFEQ     'A'
>           ITER
>           ENDIF
> < ... end of in-line edits ...>
>
> <.... whatever process ....>
>
>           ENDDO



Charlie Massoglia, Massoglia Technical Consulting, Inc.
PO Box 1065, Okemos, MI 48854, USA
517-676-9700  Fax: 517-676-1006  EMAIL: cmassoglia@voyager.net


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