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<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">My 2c worth.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">There is a small overhead in writing to the console.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Your code is writing each character separately, so 5050 writes in all.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">His is writing each string, so 100 writes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Peter Coventry<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></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""> sofdev-bounces@edulists.com.au [mailto:sofdev-bounces@edulists.com.au]
<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 (sofdev@edulists.com.au)<br>
<b>Subject:</b> [Year 12 SofDev] Code optimization<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi folks,</span><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Anyone out there able to explain why?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Cheers</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Damien</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">Next</span></span><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">Next</span></span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> star +=
<span style="color:#A31515">"*"</span></span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas">
<span style="color:blue">Next</span></span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> </span><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas"> lastTicks = currentTicks</span><o:p></o:p></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><o:p></o:p></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><o:p></o:p></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><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><o:p></o:p></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><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">p:</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"> +61 3 9490 3848</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">e:</span></b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">
<a href="mailto:damien.atkinson-buck@ivanhoe.com.au">damien.atkinson-buck@ivanhoe.com.au</a></span><o:p></o:p></p>
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