[Year 12 SofDev] MC

Wed Nov 23 08:10:45 EST 2011

I used the 1D array to teach the concept, and got my kids to implement it
in code, which they did surprisingly easily, even adding PEEK & SWAP
commands.

Actually implementing it made it far clearer to them how the stack pointer
worked to prevent having to constantly shift data in memory.

On 22 November 2011 09:32, Adrian Janson <janson.adrian.a at edumail.vic.gov.au
> wrote:

>  Hi everyone,****
>
> ** **
>
> My 2c now!****
>
> ** **
>
> I disagree with this view – we are discussing a stack implementation in a
> 1-D array and in such a case, a stack will work in exactly this way.  Isn’t
> this the way that we all taught it?  VB.Net has an inbuilt stack data
> structure and I certainly made use of it – but only after I taught my class
> how to implement a stack in a 1-D array.  I am interested to hear how
> others taught it – I just felt that if I used the ‘stack’ data structure
> that the understanding of my class would have been minimal.  I first taught
> them how a stack worked, then asked them to write a push and pop algorithm
> using a 1-D array, which we then coded – and after we had completed all of
> these – I showed them the ‘stack’ data structure in VB.Net.****
>
> ** **
>
> Is this what others are doing or am I way off base?****
>
> ** **
>
> Cheers,****
>
> Adrian****
>
> ** **
>
> *Adrian Janson **B.Sc, Dip.Ed, M.Ed
> **Director of ICT
> *Melbourne High School, Forrest Hill, South Yarra, Victoria 3141
> Australia.
> Phone: 03 9826 0711 International: +61 3 9826 0711
> Fax: 03 9826 8767 International: +61 3 9826 8767
> E-mail: janson.adrian.a at edumail.vic.gov.au****
>
> Website: http://www.mhs.vic.edu.au****
>
> Blog: http://jansona.edublogs.org****
>
> ** **
>
> ** **
>
> ** **
>
> ** **
>
> *From:* sofdev-bounces at edulists.com.au [mailto:
> sofdev-bounces at edulists.com.au] *On Behalf Of *Andrew Shortell
> *Sent:* Tuesday, 22 November 2011 8:49 AM
> *To:* Year 12 Software Development Teachers' Mailing List
> *Subject:* Re: [Year 12 SofDev] MC****
>
> ** **
>
> Hi all (you too K)
>
> Older members of the list might remember back a long time ago when we were
> taught programming.
>
> This way of doing is how it was taught way back then. It made perfect
> sense to me. (yes I am 53+ !!  ;-)
>
> Modern programming languages do not have to be so parsimonious with RAM
> and processor speed thus the implementation nowadays is not so old
> fashioned.
>
> Perhaps this is one of those times when making the effort to understand
> the exam setting panel makes sense (many of you know my preaching about
> that so no more on it now and NO I am not on the panel). Clearly the hard
> core programmer on the panel learnt theory back then... (or was taught by
> someone who learnt the theory back then.....! )
>
> Off my soapbox and back to work
> I need to start packing my gear soon as I am off to a new school in 2012
> Very exciting
>
> Andrew
>
> --
> Andrew Shortell
>
> mailto:shortell at get2me.net <shortell at get2me.net>
> Leaving the
> Heidelberg Teaching Unit at the end of 2011
> Ph 9470 3403
> Fax  9470 3215
>
>
>
> On 22/11/11 7:27 AM, "Kevork Krozian" <kevork at edulists.com.au> wrote:****
>
> Hi Gordon,
>
>  I am with you on this question.
>  This very point about the state of the stack is what gets me and every
> one of my programmer and lecturer friends scratching our heads.
>
> Once a stack is popped ( this can be demonstrated with a few short
> segments of code in PHP, C#, C++ ) any attempt to access the popped
> location leads to either garbage or undefined or no value being returned
> from the element.
>
> This clearly demonstrates that for stack data structures that are built in
> to a programming language
> 1.       Elements are not stored contiguously in memory
>
> 2.       Elements are not retained once popped
>
> 3.       There is no overwriting of a popped element by a new Push
>
>
> It seems a manual deliberate implementation with a quirky Pop method is
> the only way to duplicate the scenarios presented in both the practice and
> final exams. Whilst possible to do, it does not reflect what happens when
> programming.
>
> Kindest Regards
>
>
> Kevork Krozian
> Edulists Creator Administrator
> www.edulists.com.au
> tel: 0419 356 034
>
>
> *From:* sofdev-bounces at edulists.com.au [
> mailto:sofdev-bounces at edulists.com.au <sofdev-bounces at edulists.com.au>] *On
> Behalf Of *Poultney, Gordon A
> *Sent:* Friday, 18 November 2011 8:41 AM
> *To:* Year 12 Software Development Teachers' Mailing List
> *Subject:* Re: [Year 12 SofDev] MC
>
>
> Heath,
>
> I saw your comment and realised I must not have replied to the list
> yesterday?
>
> I was  nitpicking about A-18
>
> "re: Q 18, D is clearly the best answer.
>
> But I would have thought that the 'pop' removes reference to that
> location, while leaving '10' in memory, but not in the stack as such. 10 is
> no longer 'there' in stack. Maybe just nitpicking on my part Damien!
> At least there were 3 clearly incorrect answers.
>
> Pretty good exam for Part A and B.
>
> I still haven't read the case study through, but C-3 is a little awkward.
> I wouldn't link functional reqs. with a context diagram that only shows
> data flows - perhaps a DFD was intended here?"
>
> cheers
>            gordon
>
>
>
> *-----------
> Gordon Poultney
> Horsham College*****
>  ------------------------------
>
> *From:* sofdev-bounces at edulists.com.au [sofdev-bounces at edulists.com.au]
> on behalf of Matheson, Heath A [Matheson.Heath.A at edumail.vic.gov.au]
> *Sent:* Thursday, 17 November 2011 11:39 PM
> *To:* Year 12 Software Development Teachers' Mailing List
> *Subject:* Re: [Year 12 SofDev] MC
>
> Hi guys,
>
> I agree with Juliana’s solutions, except I think in your description of
> Q12 that B and D are non-functional requirements since they don’t affect
> the data inputs and outputs of the program. I don’t think we’re told any of
> the functional requirements for this scenario.  I think Michelle needs to
> interview the bank manager for them.
>
> For question 13, I’m 90% confident you always complete internal
> documentation while you are coding and this would be before testing which
> only leaves option B. A is incorrect as the only time you interview is in
> the analysis and evaluation phases and the question states analysis is
> complete.
>
> I had to think about Question 20. I think is a bit of a  “horses for
> courses” question between A and B. Some people like scrolling while some
> people are really good at zooming in on images with index finger and thumb
> and could click a map. This would be particularly useful if you were
> looking different countries in a region, but a problem if you don’t know
> where the country is located. So I think the scrollable list, still works
> well on the iPod. Matching characters would be difficult if there was a
> spelling error or you enter a city instead of a country (Someone asked me
> today if Dubai was a county).
>
> I’m interested to see what error Gordon has spotted.
>
> Heath Matheson
> Mount Beauty Secondary College.
> PS – I have more in my IT class next year than my biology class. First
> time for everything.
>
>
>
> *From:* sofdev-bounces at edulists.com.au [
> mailto:sofdev-bounces at edulists.com.au <sofdev-bounces at edulists.com.au>] *On
> Behalf Of *Pang, Juliana C
> *Sent:* Thursday, 17 November 2011 6:06 PM
> *To:* Year 12 Software Development Teachers' Mailing List
> *Subject:* Re: [Year 12 SofDev] MC
>
> This is just my opinion for question 12.
>
> A.      The bank does not want her to add extra functions (so this
> defines the boundary of the solution)
>
> B.      The program will be made available via the bank’s website
> (functional requirement)
>
> C.      The bank is only small and does not require a complex program
> (silly response)
>
> D.      The program must cater for visually impaired people and people
> with normal vision (functional requirement)
>
>
> So I think A.
>
>
> *From:* sofdev-bounces at edulists.com.au [
> mailto:sofdev-bounces at edulists.com.au <sofdev-bounces at edulists.com.au>] *On
> Behalf Of *El Tabbal, Riad R
> *Sent:* Thursday, 17 November 2011 5:57 PM
> *To:* sofdev at edulists.com.au
> *Subject:* [Year 12 SofDev] MC
>
> For Q12, the manager specified that the program must cater for visually
> impaired people as well as people with normal vision. What do you think?
>
> *Kind regards,
> Riad El Tabbal
> Math/IT Teacher
> Copperfield College
> Delahey Campus
> 03 9307 5555
> *
>
>
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-- 
Mark Kelly
Manager of ICT, Reporting, IT Learning Area
McKinnon Secondary College
McKinnon Rd McKinnon 3204, Victoria, Australia
Direct line / Voicemail: +613 8520 9085, Fax +613 9578 9253
kel at mckinnonsc.vic.edu.au
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