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<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU">Hi Trav,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU">Here’s a little queue example that I’ve used<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU">Regards Chris<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;color:blue;mso-fareast-language:EN-AU">Module</span><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Module1</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Sub</span> Main()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Dim</span> getYourBurger <span style="color:blue">As</span>
<span style="color:blue">New</span> <span style="color:#2B91AF">HomeMadeQueue</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">'Add some people to the queue</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"Add 'Chris' to the Queue"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> getYourBurger.EnQueue(<span style="color:#A31515">"Chris"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"Add 'Jill' to the Queue"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> getYourBurger.EnQueue(<span style="color:#A31515">"Jill"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"Add 'Ted' to the Queue"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> getYourBurger.EnQueue(<span style="color:#A31515">"Ted"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"Add 'Mel' to the Queue"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> getYourBurger.EnQueue(<span style="color:#A31515">"Mel"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">'How long is that queue?</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Dim</span> numberPeopleInQueue <span style="color:blue">
As</span> <span style="color:blue">Integer</span> = getYourBurger.Count<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"Queue length is:"</span> & numberPeopleInQueue)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">'Who is first in line?</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"The first in line is:"</span> & getYourBurger.Peek)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">'Process the queue ... do you want fries with that???</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">For</span> counter <span style="color:blue">As</span> <span style="color:blue">
Integer</span> = 1 <span style="color:blue">To</span> numberPeopleInQueue<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"Hi "</span> & getYourBurger.DeQueue() &
<span style="color:#A31515">", what burger would you like?"</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Next</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">'What happens if we try to process an empty queue</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.WriteLine(<span style="color:#A31515">"Is there anybody out there??? "</span> & getYourBurger.DeQueue())<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:#2B91AF">Console</span>.ReadLine()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">End</span> <span style="color:blue">Sub</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' </span><span style="color:gray"><summary></span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' The following Queue class implementation includes methods for EnQueue,</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' DeQueue, ClearQueue (clearing the queue), Peek, and Count, as well as a</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' default constructor for the class.</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' </span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> <span style="color:green">''' The underlying data structure used to hold the queue data is an ArrayList. This is</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' used because their dynamic nature, i.e. Insert is added to the next free element of the list,
</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> <span style="color:green">''' remove from front automatically moves each item in the list up one element, and we don't need
</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> <span style="color:green">''' to maintain any placeholders (first item, last item etc...)</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' </span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> <span style="color:green">'''
</span><span style="color:gray"></summary></span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' </span><span style="color:gray"><remarks></span><span style="color:green">This is closely based on content from "Data Structures and Algorithms Using Visual Basic.NET"</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' by Michael McMillan (ISBN:9780521547659)</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:green">''' </span><span style="color:gray"></remarks></span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Public</span> <span style="color:blue">Class</span> <span style="color:#2B91AF">
HomeMadeQueue</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Private</span> _queue <span style="color:blue">As</span>
<span style="color:blue">New</span> <span style="color:#2B91AF">ArrayList</span>()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Public</span> <span style="color:blue">Sub</span> <span style="color:blue">
New</span>()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">MyBase</span>.New()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">End</span> <span style="color:blue">Sub</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Public</span> <span style="color:blue">Sub</span> EnQueue(<span style="color:blue">ByVal</span> item
<span style="color:blue">As</span> <span style="color:blue">Object</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> _queue.Add(item)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">End</span> <span style="color:blue">Sub</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Public</span> <span style="color:blue">Function</span> DeQueue()
<span style="color:blue">As</span> <span style="color:blue">Object</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Dim</span> item <span style="color:blue">As</span> <span style="color:blue">
Object</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">If</span> Count() > 0 <span style="color:blue">Then</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> item = _queue.Item(0)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> _queue.RemoveAt(0)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Else</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> item =
<span style="color:#A31515">"Queue empty error"</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">End</span> <span style="color:blue">If</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Return</span> item<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">End</span> <span style="color:blue">Function</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Public</span> <span style="color:blue">Function</span> Peek()
<span style="color:blue">As</span> <span style="color:blue">Object</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Return</span> _queue.Item(0)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">End</span> <span style="color:blue">Function</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Public</span> <span style="color:blue">Sub</span> ClearQueue()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> _queue.Clear()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">End</span> <span style="color:blue">Sub</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Public</span> <span style="color:blue">Function</span> Count()
<span style="color:blue">As</span> <span style="color:blue">Integer</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
<span style="color:blue">Return</span> _queue.Count()<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU"> <span style="color:blue">End</span>
<span style="color:blue">Function</span><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:12.0pt;font-family:Consolas;mso-fareast-language:EN-AU">
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:EN-AU">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:EN-AU"> sofdev-bounces@edulists.com.au
[mailto:sofdev-bounces@edulists.com.au] <b>On Behalf Of </b>Travis Parker<br>
<b>Sent:</b> Thursday, 4 August 2011 8:16 AM<br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List<br>
<b>Subject:</b> [Year 12 SofDev] Queues in VB.net<o:p></o:p></span></p>
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<p><span style="font-family:"Calibri","sans-serif"">Dear All,<span style="color:#1F497D"><o:p></o:p></span></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:#1F497D">I am currently doing some stuff in data structures and going to create a queue example in VB.net. Does anyone have an example of these? I am thinking that I will use a queue as part of U4O1.
I’ve already done a stack example but am going to write a SAC with a waiting list FIFO so need to use a queue.<o:p></o:p></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:#1F497D">Any assistance from the brilliant programmers on the list would be much appreciated and save me some time!<o:p></o:p></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:#1F497D">Cheers<o:p></o:p></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:#1F497D">Trav<o:p></o:p></span></p>
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