Re: RPG read loops

[rick baird <rick.baird@xxxxxxxxx>]

a strait line?   one line?  


On Tue, 1 Feb 2005 14:39:06 -0600, Bob Cozzi <cozzi@xxxxxxxxx> wrote:
> Yes there is a better way...
> I will only tell you the answer, however, after you send me a diagram
> illustrating how, in the figure below, to connect the top row of 3 dots with
> the bottom row of 3 dots using a line drawn with a pen or pencil WITHOUT
> ever allowing any of the lines to intersect. This has to be accomplished on
> a two-dimensional surface. You have ten minutes... Go!
> 
>   *          *          *
> 
>   *          *          *
> 
> 
> -Bob Cozzi
> 
> 
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
> On Behalf Of Paul Morgan
> Sent: Tuesday, February 01, 2005 2:27 PM
> To: rpg400-l@xxxxxxxxxxxx
> Subject: RPG read loops
> 
> Almost all of the code in the current Leave / Iter thread showed a loop
> like:
> 
> DoU F3 or F12
>    exfmt
>    If Not (F3 or F12)
>       //  do something
>    EndIf
> EndDo
> 
> This only has one exfmt statement inside a DoU loop.  A similar file read
> loop would be:
> 
> DoU %EoF
>    Read
>    If Not %Eof
>       // do something
>    EndIf
> EndDo
> 
> which has one read statement inside of a DoU loop.  Isn't there a better way
> of coding loops with more than one read/exfmt like:
> 
> exfmt
> DoW Not (F3 or F12)
>    //  do something
>    exfmt
> EndDo
> 
> or
> 
> Read
> DoW Not %Eof
>    // do something
>    Read
> EndDo
> 
> or
> 
> SetLL
> ReadE
> DoW Not %Eof
>    // do something
>    ReadE
> EndDo
> 
> Most programmers seem to code with the single read/exfmt style which IMHO
> complicates the code.  In a DoU/Read loop the body of the loop is nested two
> deep inside the DoU and an If statement.  In a Read/DoW/Read loop the body
> of the loop is nested one deep inside a DoW.  Doesn't this reduction in the
> nesting of the body of the loop improve the program?  Readability is
> improved.  Performance is also improved (although minor) with the removal of
> one test against the end of loop.
> 
> Other programmers I work with are adamant about not coding more than one
> read statement.  Why is coding more than one read statement such a problem?
> 
> Paul
> 
> --
> Paul Morgan
> Senior Programmer Analyst - Retail
> J. Jill Group
> 100 Birch Pond Drive, PO Box 2009
> Tilton, NH 03276-2009
> Phone: (603) 266-2117
> Fax:   (603) 266-2333
> 
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