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<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D">Thanks Peter, I hadn’t thought of that, it makes perfect sense
</span></a></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Damien</span></b><b><span style="font-size:12.0pt; font-family:"Arial","sans-serif"; color:black">
</span></b><b><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Atkinson-Buck</span></b><span style="font-size:12.0pt; font-family:"Arial","sans-serif"; color:#1F497D"><br>
</span><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Head of Learning Area: Technology/Arts</span><span style="font-size:12.0pt; font-family:"Arial","sans-serif"; color:black"> </span><span style="font-size:12.0pt; font-family:"Arial","sans-serif"; color:#1F497D"><br>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Coventry, Peter J [mailto:coventry.peter.j@edumail.vic.gov.au]
<br>
<b>Sent:</b> Friday, 22 March 2013 3:12 PM<br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List<br>
<b>Subject:</b> Re: [Year 12 SofDev] Code optimization</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="color:#1F497D">Hi,</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">My 2c worth.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">There is a small overhead in writing to the console.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Your code is writing each character separately, so 5050 writes in all.</span></p>
<p class="MsoNormal"><span style="color:#1F497D">His is writing each string, so 100 writes.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Cheers,</span></p>
<p class="MsoNormal"><span style="color:#1F497D">Peter Coventry</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">
<a href="mailto:sofdev-bounces@edulists.com.au">sofdev-bounces@edulists.com.au</a> [<a href="mailto:sofdev-bounces@edulists.com.au">mailto:sofdev-bounces@edulists.com.au</a>]
<b>On Behalf Of </b>ATKINSON-BUCK, Damien<br>
<b>Sent:</b> Friday, 22 March 2013 9:05 AM<br>
<b>To:</b> Year 12 Software Development Teachers' Mailing List (<a href="mailto:sofdev@edulists.com.au">sofdev@edulists.com.au</a>)<br>
<b>Subject:</b> [Year 12 SofDev] Code optimization</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Hi folks,</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> I’ve just started going through loops and leading into multi-dimensional arrays. Last night the boys did the first 2 exercises of Marks old “Arrays and Loops Exercises”.
In the increasing stars program, he managed to do it in 2 less lines of code and so I was curious as to which was physically faster. I put a timer class into the code to test it, and his was dramatically faster. 0.415 sec versus 0.084 sec</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Anyone out there able to explain why?</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Cheers</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Damien</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Sub</span> Main()</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas"> </span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">'My version</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Dim</span> firstTick <span style="color:blue">As</span> <span style="color:#2B91AF">
TickTimer</span> = <span style="color:blue">New</span> <span style="color:#2B91AF">
TickTimer</span>()</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<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> 100</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">For</span> InnerCounter = 1 <span style="color:blue">To</span> counter</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:#2B91AF">Console</span>.Write(<span style="color:#A31515">"*"</span>)</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Next</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:#2B91AF">Console</span>.WriteLine()</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Next</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas"> </span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">'Adems version</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Dim</span> secondTick <span style="color:blue">As</span>
<span style="color:#2B91AF">TickTimer</span> = <span style="color:blue">New</span>
<span style="color:#2B91AF">TickTimer</span>()</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Dim</span> star <span style="color:blue">As</span> <span style="color:blue">
String</span> = <span style="color:#A31515">"*"</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">For</span> counter2 <span style="color:blue">As</span> <span style="color:blue">
Integer</span> = 1 <span style="color:blue">To</span> 100</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:#2B91AF">Console</span>.WriteLine(star)</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas"> star +=
<span style="color:#A31515">"*"</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Next</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas"> </span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">'display timing</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:#2B91AF">Console</span>.WriteLine(firstTick.DeltaSeconds(<span style="color:#A31515">"Mine"</span>))</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:#2B91AF">Console</span>.WriteLine(secondTick.DeltaSeconds(<span style="color:#A31515">"Adems"</span>))</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">'wait til key pressed</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:#2B91AF">Console</span>.ReadKey()</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">End</span> <span style="color:blue">Sub</span></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Public</span> <span style="color:blue">Class</span> <span style="color:#2B91AF">
TickTimer</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Public</span> currentTicks <span style="color:blue">As</span>
<span style="color:blue">Long</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Public</span> lastTicks <span style="color:blue">As</span>
<span style="color:blue">Long</span> = System.<span style="color:#2B91AF">DateTime</span>.Now.Ticks</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Public</span> retVal <span style="color:blue">As</span> <span style="color:blue">
String</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' </span><span style="color:gray"><summary></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' Calculates the seconds it took since the class was instantiated until this method</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' is first invoked and for subsequent calls since the previous time the method was called</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' </span><span style="color:gray"></summary></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' </span><span style="color:gray"><param name="message"></span><span style="color:green">Message (e.g. "The last query took ")</span><span style="color:gray"></param></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' </span><span style="color:gray"><returns></span><span style="color:green">The passed string followed by the seconds: " The last query took, 0.3456"</span><span style="color:gray"></returns></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' </span><span style="color:gray"><remarks></span><span style="color:green">To see how long it takes a method to execute instantiate this class at its</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:green">''' very begining and call this method just before it returns; Log the result with Debug.Writeln or something similar</span><span style="color:gray"></remarks></span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Public</span> <span style="color:blue">Function</span> DeltaSeconds(<span style="color:blue">ByVal</span> message
<span style="color:blue">As</span> <span style="color:blue">String</span>) <span style="color:blue">
As</span> <span style="color:blue">String</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas"> currentTicks = System.<span style="color:#2B91AF">DateTime</span>.Now.Ticks</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas"> retVal =
<span style="color:blue">String</span>.Format(<span style="color:#A31515">"{0}, {1}"</span>, message.PadLeft(100), ((currentTicks - lastTicks) /
<span style="color:#2B91AF">TimeSpan</span>.TicksPerSecond).ToString().PadRight(15))</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas"> lastTicks = currentTicks</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">Return</span> retVal</span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">End</span> <span style="color:blue">Function</span></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt; font-family:Consolas">
<span style="color:blue">End</span> <span style="color:blue">Class</span></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt; font-family:"Times New Roman","serif"; color:#880231"><br>
</span></b><b><span style="font-size:12.0pt; font-family:"Arial","sans-serif"; color:#82002C">Damien</span></b><b><span style="font-size:9.0pt; font-family:"Times New Roman","serif"; color:#880231">
</span></b><b><span style="font-size:12.0pt; font-family:"Arial","sans-serif"; color:#880231">Atkinson-Buck</span></b><span style="font-size:12.0pt; font-family:"Times New Roman","serif""><br>
</span><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Head of Learning Area: Technology/Arts</span><span style="font-size:8.0pt; font-family:"Times New Roman","serif"; color:black">
</span></p>
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The School does not represent or warrant that the email or any files attached do not contain errors or are free from computer viruses or other defects nor does it accept responsibility for any loss or damage resulting directly or indirectly from the use of
the email or any attached files. </span></p>
<p><b>Important - </b>This email and any attachments may be confidential. If received in error, please contact us and delete all copies. Before opening or using attachments check them for viruses and defects. Regardless of any loss, damage or consequence, whether
caused by the negligence of the sender or not, resulting directly or indirectly from the use of any attached files our liability is limited to resupplying any affected attachments. Any representations or opinions expressed are those of the individual sender,
and not necessarily those of the Department of Education and Early Childhood Development.</p>
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Privacy, Virus and Copyright Warning<br>
<br>
The information contained in this electronic message (e-mail), and any files transmitted with it:<br>
<br>
* is intended for the named recipients only. If you have received this in error, please advise the sender and delete it and any copies immediately;<br>
* Any personal information in this email must be used in accordance with the Privacy Act 1988 and this always applies even if it has been sent to you in error.<br>
* represents the views of the sender and does not necessarily represent the views or formal advice of Ivanhoe Grammar School;<br>
* may be subject to Copyright, so no further use should be made of it without the author's permission.<br>
<br>
The School does not represent or warrant that the email or any files attached do not contain errors or are free from computer viruses or other defects nor does it accept responsibility for any loss or damage resulting directly or indirectly from the use of
the email or any attached files.
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