[Year 12 SofDev] Re: SD VITTA exam 2, multichoice #1
Kevin Feely
feely.kevin.k at edumail.vic.gov.au
Wed Oct 17 09:29:12 EST 2007
Hi Mark,
For i= 1 to ... will set i to 1 and you will get at least 1 loop.
for-next cannot be written (and why would you) so that you do not get
the loop at least once..
For next is an iteration construct
The other 2 are conditional branching constructs
So logically for-next is not a test but an iteration control - the other
2 are branching controls DESIGNED for testing. One when you will need to
loop at least once, and the other in cases when the loop may not need to
not execute at all.
What do we have .......the 4 main programming constructs ...
* Sequence .... a series of line of code
* Repetition (aka iteration or Loops) - where you would use for next
or whatever the program uses for iterations
* Conditional Branching
* Combined Branching and Repetition
o Conditional test at start of the construct - the "while-do"
o Conditional test at the end of the construct - the
"repeat-until"
(taken from http://www.tutorials4u.com/c/loopsdecisions.htm)
Mark Kelly wrote:
> Ah, but FOR..NEXT does test whether the index is beyond the specified
> boundaries.
>
> e.g. FOR i = 1 to 5
>
> is an implicit pre-test for i>5.
>
> Cheers
> Mark
>
> Kevin Feely wrote:
>> Hi All,
>> I would approach the question with - is their a value for which this
>> loop would NOT execute?
>> If it is a pre test condition then you will not get any processing
>> from the lines within the loop, if it is a post test condition then
>> the loop will execute AT LEAST ONCE.
>> Also i (that is me myself I mwa) accept that the logic of a do-while
>> loop is to test the condition before the loop starts, and the
>> repeat-until loop tests at the end of the loop (the construct within
>> a language will vary BUT in generic terms i accept this "standard"),
>> even though the ACTUAL written algorithm on the question is not
>> perfect ( I suppose thats hard to do unless you write it in 9
>> diiferent languages, but then again it is supposed to be in pcode
>> format and therefore language independent)
>> Also the for-next answer seems to be a bit of a distraction as it
>> does not TEST for anything, it will simply loop as many times as you
>> want, via a variable used as a counter, and this could be from 0
>> times to a big number.
>> So i would think the expected answer was A
>> regards
>> kev
>>
>>
>> Sonia Cotugno wrote:
>>> I agree with you Mark.
>>>
>>> I answered with (C) For...Next because none of the others tested at
>>> the top of the loop. I think it's actually incorrect to say
>>> Do...While. I really do think it should have said While as an option.
>>>
>>> Regards,
>>> Sonia Cotugno
>>>
>>>
>>> Brighton Grammar School
>>> 90 Outer Cres
>>> Brighton VIC 3186
>>> (03) 8591 2200
>>> www.brightongrammar.vic.edu.au <http://www.brightongrammar.vic.edu.au>
>>>
>>>
>>>
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>>> 1. SD VITTA exam 2, multichoice #1 (Mark Kelly)
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>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Fri, 12 Oct 2007 11:59:09 +1000
>>> From: Mark Kelly <kel at mckinnonsc.vic.edu.au>
>>> Subject: [Year 12 SofDev] SD VITTA exam 2, multichoice #1
>>> To: "Year 12 Software Development Teachers' Mailing List"
>>> <sofdev at edulists.com.au>
>>> Message-ID: <470ED4ED.3020009 at mckinnonsc.vic.edu.au>
>>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>>
>>> 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
>>> Manager - Information Systems
>>> McKinnon Secondary College
>>> McKinnon Rd McKinnon 3204, Victoria, Australia
>>> Direct line / Voicemail: 8520 9085
>>> School Phone +613 8520 9000
>>> School Fax +613 95789253
>>> kel AT mckinnonsc.vic.edu.au
>>>
>>> Webmaster - http://www.mckinnonsc.vic.edu.au
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