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<p>Hi John,</p>
<p>the sign <= is used for conditions and means "Is less than or equal to"</p>
<p>eg</p>
<p> IF x <= 5 THEN</p>
<p> DISPLAY "x is less than or equal to 5"</p>
<p> END IF</p>
<p><br>
</p>
<p>I think in your example below you are assigning a value, in which case you would use <- (an arrow).</p>
<p>ie</p>
<p> <span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"> x <-</span><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"> 1</span></p>
<p><br>
</p>
<p>The line </p>
<p><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"> Print time(x)</span><br>
</p>
<p><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;">seems to suggest you have an array called "time" and it contains values. Is that provided as part of the question? It is not possible to do a trace table for the question without that
information.</span></p>
<p><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"><br>
</span></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">The line</span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;"> x+1</span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">is possiblly meant to increment x but as there is no indication that the incremented value is stored anywhere it is not valid.</span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">You need something like </span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;"> x <- x+1</span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">or</span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;"> increment x by 1</span><br>
</span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;"><br>
</span></span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;">But even after all of that I am not clear what the purpose of the algorithm is?</span></span></font></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;"><span style="font-family: Calibri, Arial, Helvetica, sans-serif;"><br>
</span></span></font></p>
<p><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;">I think it needs rewording like this:</span></p>
<p><span style="font-family: Calibri, sans-serif; font-size: 14.6667px;"><br>
</span></p>
<p><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">time is an array ...<insert description/diagram showing the values the array contains here></span></font></p>
<p><br>
</p>
<p>BEGIN</p>
<p></p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
x <- 1</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
arrlength <-4</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
while x < arrlength</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Print “Time” + x</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Print time(x)</p>
<p style="text-indent: 0px; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 11pt; text-indent: 36pt;"> x <- x + 1</span></p>
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End while</p>
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END</p>
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<br>
</p>
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<br>
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I have attached the work we did during stepup - with answers. You need do delete the contents of the tables to allow students to fill them in.</p>
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<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Hope that helps.</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Esther.</p>
<br>
<p></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> sofdev-bounces@edulists.com.au <sofdev-bounces@edulists.com.au> on behalf of WILKIE. John <wilkjoh1@lavalla.vic.edu.au><br>
<b>Sent:</b> 28 February 2017 10:09<br>
<b>To:</b> sofdev@edulists.com.au<br>
<b>Subject:</b> [Year 12 SofDev] loops and trace tables</font>
<div> </div>
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<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Hi All!</p>
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</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Hope you are all good. First time Soft Dev teacher here.</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
I’m looking at loops and trace tables at the moment. I’d like to confirm the Pseudocode you could use for a loop? And then how the trace table would look. At the moment I have:</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
x < = 1 </p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
arrlength <= 4</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
while x < arrlength</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Print “Time” + x </p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Print time(x)</p>
<p style="text-indent: 36pt; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
x + 1</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
End while</p>
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</p>
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<b>x</b></p>
</td>
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<b>arrlength</b></p>
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<b>output</b></p>
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<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
1</p>
</td>
<td width="75" valign="top" style="width:55.9pt; border-top:none; border-left:none; border-bottom:solid windowtext 1.0pt; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt">
<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
4</p>
</td>
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<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Time1 time1</p>
</td>
</tr>
<tr>
<td width="78" valign="top" style="width:58.2pt; border:solid windowtext 1.0pt; border-top:none; padding:0cm 5.4pt 0cm 5.4pt">
<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
2</p>
</td>
<td width="75" valign="top" style="width:55.9pt; border-top:none; border-left:none; border-bottom:solid windowtext 1.0pt; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt">
<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
4</p>
</td>
<td width="91" valign="top" style="width:68.5pt; border-top:none; border-left:none; border-bottom:solid windowtext 1.0pt; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt">
<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Time2 time2</p>
</td>
</tr>
<tr>
<td width="78" valign="top" style="width:58.2pt; border:solid windowtext 1.0pt; border-top:none; padding:0cm 5.4pt 0cm 5.4pt">
<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
3</p>
</td>
<td width="75" valign="top" style="width:55.9pt; border-top:none; border-left:none; border-bottom:solid windowtext 1.0pt; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt">
<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
4</p>
</td>
<td width="91" valign="top" style="width:68.5pt; border-top:none; border-left:none; border-bottom:solid windowtext 1.0pt; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt">
<p align="center" style="text-align: center; margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Time3 time3</p>
</td>
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4</p>
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4</p>
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-</p>
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</p>
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</p>
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</p>
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</p>
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</p>
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</p>
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<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
(time is an array where x will be the position in array ie. time1, time2 etc.)</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
I think the logic is there, but another pair of eyes will help my tired brain. Any major issues?
</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
Also, are there any good Pseudocode examples (possibly with trace tables) that anyone is happy to share?</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
</p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="">Regards,</span></p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style=""> </span></p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="">John Wilkie</span></p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style=""> </span></p>
<p style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
</p>
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