[Year 12 SofDev] SD VITTA exam 2, multichoice #1

[Frank Van Den Boom]

While I have only used about 5 different languages in my programming
past, I have not seen an implementation of While which tests at bottom
of loop. Are there languages that offer this?

-----Original Message-----
From: sofdev-bounces at edulists.com.au
[mailto:sofdev-bounces at edulists.com.au] On Behalf Of Mark Kelly
Sent: Friday, 12 October 2007 12:53 PM
To: Year 12 Software Development Teachers' Mailing List
Subject: Re: [Year 12 SofDev] SD VITTA exam 2, multichoice #1

I'm thinking of a different DO..WHILE syntax as in...

DO
    ...
WHILE <condition>

which means it always loops at least once.

And I interpret the dots in "DO..WHILE" expressions to mean "loop
contents go here" so the DO is at the top and the WHILE is in fact at
the bottom.

As in the classical FOR..NEXT, the FOR is at the top, the NEXT at the
end.

Frank Van Den Boom wrote:
> Not sure if I clearly understand why you think Do..While tests at the 
> bottom of the loop.
> When option A states it as "Do..While", it is not meant to imply that 
> the "Do" bit is at the top and the "While" bit at the bottom - both of

> these bits are in the statement at the top of the loop. Eg. As well as

> the old While/Wend, VB also offers the following
> 
> Do While Count < 10
> ..
> ..
> Loop
> 
> In Pascal, it was done something like:
> While Count < 10
> Begin
> ..
> ..
> End
> 
> I remember reading years ago, that some classic programmers would 
> always use a while loop in place of a repeat loop as a matter of 
> principle to cover the possibility that you don't want the loop
entered at all.
> 
> Frank
> -----Original Message-----
> From: sofdev-bounces at edulists.com.au
> [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Mark Kelly
> Sent: Friday, 12 October 2007 11:59 AM
> To: Year 12 Software Development Teachers' Mailing List
> Subject: [Year 12 SofDev] SD VITTA exam 2, multichoice #1
> 
> I'm curious what others think...
> 
> "Testing at the 'top of the loop' is performed by which syntax in 
> pseudo-code?
> 
> A. Do..While
> B. Do..Until
> C. For..Next
> D. EOF"
> 
> The suggested answer given is A, with the explanation that 'Do..Until 
> is often referred to as testing at the bottom of the loop...'
> 
> But surely both do..while and do..until both test at the bottom of the

> loop.
> 
> A While..Wend, on the other hand, tests at the top.
> 
> --
> Mark Kelly


--
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