1567 /www/nrich/html/content/02/06/logo1/ 1 2011-02-01T00:00:01 <mdoxml version="1.0"><p><span class="editorial">Beginners to LOGO programming may want to start by working through the <a href="https://nrich.maths.org/8045">FIRST FORWARD series of introductory articles</a> before tackling this problem.</span></p> <p> </p> <h4>Tiling Designs</h4> <p>Inside a London tiling shop were some spectacular designs for people to choose from when deciding to tile their kitchens, bathrooms, hallways or wherever!</p> <p>Three designs in particular caught my eye and I invite you is to reproduce these tilings using LOGO procedures.</p> <p><mdo:image alt="" src="pic1.gif"></mdo:image> <mdo:image alt="" src="pic2.gif"></mdo:image></p> <br></br> <table width=""> <tbody> <tr> <td><mdo:image alt="" src="pic3.gif"></mdo:image></td> <td>Alternatively you might like<br></br> to experiment with the following: <p><strong>TO TRI :X :Y<br></br> IF :X &lt; :Y [STOP]<br></br> REPEAT 3 [ FD :X TRI :X/2 :Y RT 120]<br></br> END</strong></p> <p>Begin with TRI 100 4 and see<br></br> what conclusions you can reach.</p> <p>Why not expand the procedure to<br></br> draw squares?</p> </td> </tr> </tbody> </table> <br></br> <h4>Extension:</h4> <p>Consider the following procedure which like those from <a href="/1566">last month</a> uses a variable:</p> <p>TO SEQUENCE :N<br></br> PRINT :N<br></br> WAIT 20<br></br> SEQUENCE :N + 1<br></br> END</p> <p>n.b. the primitive WAIT is to simply slow the procedure down.</p> <p>Talk through with others what you think is happening.</p> <p><strong>Type in the procedure and test out your thinking.</strong></p> <p>Consider the following procedures in turn.</p> <p>Talk each one through with others.<br></br> Make notes about what you think will happen.<br></br> THEN type in the procedure and test out your thoughts.</p> <p>TO SEQUENCE2 :N<br></br> PRINT :N<br></br> WAIT 20<br></br> SEQUENCE2 :N * 2<br></br> END</p> <p>TO SEQUENCE3 :N<br></br> PRINT :N<br></br> WAIT 20<br></br> SEQUENCE3 :N *2 - 1<br></br> END</p> <table width="400"> <tbody> <tr> <td>TO SEQUENCE4 :N<br></br> PRINT :N<br></br> WAIT 20<br></br> SEQUENCE4 :N - 4<br></br> END</td> <td>TO SEQUENCE5 :N<br></br> PRINT :N<br></br> WAIT 20<br></br> SEQUENCE5 :N *2 + 3<br></br> END</td> </tr> </tbody> </table> <p> </p></mdoxml> 2 3 0 0 1 0 0 Tiling Designs Imported legacy Object Not Tagged Not tagged