Re: RE: RPG read loops

[Jonathan Mason <masonjo1@xxxxxxxxxxxxxxxx>]

Wasn't the original problem posed that it had to be done on a two-dimensional 
surface, which space (curved or otherwise) isnt?

The only solution I've ever seen for this that works is to draw the dots on an 
inflated inner tube for a wheel and that way the lines can go under as well as 
over.  Unfortunately that doesn't fit the 2D requirement either...

However, getting back to the original thread (and keeping within list 
guidelines) of whether or not DOU is better than DOW, I was always taught that 
it depended on the loop you were trying to achieve.

As a DOU has the test at the end of the loop, then there will always be one 
iteration of the loop regardless of the value of whether the testing condition 
is met or not at the start of the loop.  The DOW, on the other hand, performs 
the test at the beginning of the loop and if the conditions are not met then no 
iterations will be performed.

Surely as professional programmers we should be using the correct form of DO 
loop for the situation at hand and understanding the correct use of the various 
DO loops should mean that readability of a program is not adversely affected.  
It's only my opinion, but I would find it harder to follow a program where the 
programmer has forced a DOU to act like a DOW (or vice versa) just because it's 
their preference.

Best regards

Jonathan



-----Original message-----
From: "DeLong, Eric" EDeLong@xxxxxxxxxxxxxxx
Date: Tue,  1 Feb 2005 22:36:40 +0000
To: "'RPG programming on the AS400 / iSeries'" rpg400-l@xxxxxxxxxxxx
Subject: RE: RPG read loops

> Well, curved space isn't all that's needed....  The universe must also be
> closed, in order for the line to wrap around it, so that it may pass
> parallel to itself.  I think the consensus right now is that the universe is
> essentially flat, making this solution  impossible once again.  
> 
> jmho,
> 
> Eric DeLong
> Sally Beauty Company
> MIS-Project Manager (BSG)
> 940-297-2863 or ext. 1863
> 
> 
> 
> -----Original Message-----
> From: Bob Cozzi [mailto:cozzi@xxxxxxxxx]
> Sent: Tuesday, February 01, 2005 3:56 PM
> To: 'RPG programming on the AS400 / iSeries'
> Subject: RE: RPG read loops
> 
> 
> Yes I think I attempted that solution in 7th grade, but ran out of time at
> about the edge of the known universe.
> -Bob
> (Apologies to David G. for the digression) 
> 
> -----Original Message-----
> From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx]
> On Behalf Of Tony Carolla
> Sent: Tuesday, February 01, 2005 3:38 PM
> To: RPG programming on the AS400 / iSeries
> Subject: Re: RPG read loops
> 
> <snip>
> > You've got the answer.
> > It cannot be done.
> </snip>
> 
> NO!  NO!  I GET IT!  You see, space... is curved... so if you keep
> drawing a "straight line", sooner or later it will curve?
> 
> Good one Bob!  
> 
> 
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Jonathan Mason
www.astradyne-uk.com