1542
/www/nrich/html/content/00/03/logo1/
1
2011-02-01T00:00:01
<?xml version="1.0" encoding="UTF-8"?>
<mdoxml version="1.0"><p><a href="https://nrich.maths.org/8045">First Forward Into Logo</a><br></br>
<strong>Previous:</strong><a href="http://nrich.maths.org/public/viewer.php?obj_id=4857&part="> FF9</a></p>
<p> </p>
<p class="editorial">WARNING - You may need to press "Halt" to stop some of these procedures!!</p>
<br></br>
<p>You might like to begin by thinking about two procedures:</p>
<blockquote>
<pre>
TO COUNTUP :X
PR :X
COUNTUP :X + 3
END
</pre></blockquote>
<p>Try COUNTUP 2</p>
<blockquote>
<pre>
TO COUNTDOWN :X
PR :X
COUNTDOWN :X - 2
END
</pre></blockquote>
<p>Try COUNTDOWN 189</p>
<p>As before, discuss with others and try evaluating the procedures BEFORE copying them out and experimenting further.</p>
<p>Now, here are two more procedures you might like to think about:</p>
<blockquote>
<pre>
TO FAC :X :A
PR :A
FAC :X + 1 :X * :A
END
</pre></blockquote>
<p>Try FAC 11</p>
<blockquote>
<pre>
TO MULTI :X :A
PR :A
MULTI :X :X + :A
END
</pre></blockquote>
<p>Try MULTI 2 0; MULTI 2 1 ...etc</p>
<p>Can all the sequences of number that you know, be programmed in LOGO?</p>
<p>Why not submit other procedures that you have used to generate other special number sequences?</p>
<p>While geometrically</p>
<p>...the challenge is to program ELEGANTLY the drawing of the smaller pentagrams onto the 'arms' of the larger one, as shown below.</p>
<p><mdo:image alt="" height="412" src="fig1.gif" width="402"></mdo:image></p>
<p> </p>
<p><strong>Next:</strong><a href="http://nrich.maths.org/public/viewer.php?obj_id=4860&part=INDEX"> FF11</a></p>
<p> </p>
<p> </p></mdoxml>
2
3
0
0
1
1
1
First Forward into Logo 10: Count Up - Count Down
What happens when a procedure calls itself?
Sequences, Functions and Graphs
Iteration
Using, Applying and Reasoning about Mathematics
Practical Activity
Information and Communications Technology
Logo