https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?action=history&feed=atom&title=Attribute_Grammars%2FExercise_3%3A_Expressions 2026-05-10T12:30:06Z Revision history for this page on the wiki MediaWiki 1.39.5 https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=11031&oldid=prev 2018-12-05T23:13:58Z

<p>Redirected page to <a href="https://web.tecnico.ulisboa.pt/~david.matos/w/pt/index.php/Attribute_Grammars/Exercise_3:_Expressions" class="extiw" title="ist:Attribute Grammars/Exercise 3: Expressions">ist:Attribute Grammars/Exercise 3: Expressions</a></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 23:13, 5 December 2018</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">== Problem (in Portuguese) ==</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">#REDIRECT </ins>[[<ins style="font-weight: bold; text-decoration: none;">ist</ins>:<ins style="font-weight: bold; text-decoration: none;">Attribute Grammars/Exercise 3</ins>: <ins style="font-weight: bold; text-decoration: none;">Expressions</ins>]]</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;A gram&amp;aacute;tica seguinte admite atribui&amp;ccedil;&amp;otilde;es dentro de express&amp;otilde;es.&lt;/span&gt;&lt;/p&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;tr&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;td align=&quot;left&quot; style=&quot;padding-left: 100px;&quot;&gt;S -&amp;gt; E&lt;/td&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;/tr&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;tr&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;td align=&quot;left&quot; style=&quot;padding-left: 100px;&quot;&gt;E -&amp;gt; E '''+''' E | E ''':=''' E | '''(''' E ''')''' | '''id'''&lt;/td&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;/tr&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;/table&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Quando uma express&amp;atilde;o est&amp;aacute; a ser analisada &amp;eacute; necess&amp;aacute;rio diferenciar os casos onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; direita, daqueles onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; esquerda, do sinal de atribui&amp;ccedil;&amp;atilde;o. Note que n&amp;atilde;o &amp;eacute; poss&amp;iacute;vel atribuir um valor a uma express&amp;atilde;o. Por exemplo a express&amp;atilde;o '''id + id := id''' &amp;eacute; ilegal. No entanto, as express&amp;otilde;es '''id := ( id + id )''', quer    '''id := ( id := id )''', ou ainda '''( id ) := ( id := ( id + id ) )''' s&amp;atilde;o autorizadas.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Considere que o operador ''':=''' &amp;eacute; menos priorit&amp;aacute;rio que o operador '''+''', al&amp;eacute;m de associativo &amp;agrave; direita, enquanto o operador '+' &amp;eacute; associativo &amp;agrave; esquerda.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Escreva um esquema de tradu&amp;ccedil;&amp;atilde;o que usa um atributo herdado (e nenhum sintetizado) chamado '''lado''' associado ao s&amp;iacute;mbolo '''E''', e que determina se a express&amp;atilde;o corrente est&amp;aacute; &amp;agrave; direita ou &amp;agrave; esquerda da atribui&amp;ccedil;&amp;atilde;o. O c&amp;oacute;digo associado &amp;agrave; gram&amp;aacute;tica emitir&amp;aacute; uma mensagem de erro caso a express&amp;atilde;o seja ilegal.</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">== Solution ==</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[<del style="font-weight: bold; text-decoration: none;">category</del>:<del style="font-weight: bold; text-decoration: none;">Compiladores]]</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">[[category</del>:<del style="font-weight: bold; text-decoration: none;">Ensino</del>]]</div></td><td colspan="2" class="diff-side-added"></td></tr> </table>

Root https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=9751&oldid=prev 2018-04-10T15:10:27Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:10, 10 April 2018</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3">Line 3:</td> <td colspan="2" class="diff-lineno">Line 3:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;<del style="font-weight: bold; text-decoration: none;">right</del>&quot;&gt;S -&amp;gt; E&lt;/td&gt;</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;<ins style="font-weight: bold; text-decoration: none;">left&quot; style=&quot;padding-left: 100px;</ins>&quot;&gt;S -&amp;gt; E&lt;/td&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;<del style="font-weight: bold; text-decoration: none;">right</del>&quot;&gt;E -&amp;gt; E '''+''' E | E ''':=''' E | '''(''' E ''')''' | '''id'''&lt;/td&gt;</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;<ins style="font-weight: bold; text-decoration: none;">left&quot; style=&quot;padding-left: 100px;</ins>&quot;&gt;E -&amp;gt; E '''+''' E | E ''':=''' E | '''(''' E ''')''' | '''id'''&lt;/td&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/table&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/table&gt;</div></td></tr> </table>

Root https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=9750&oldid=prev 2018-04-10T15:09:36Z

<p><span dir="auto"><span class="autocomment">Problem (in Portuguese)</span></span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:09, 10 April 2018</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3">Line 3:</td> <td colspan="2" class="diff-lineno">Line 3:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;right&quot;&gt;S<del style="font-weight: bold; text-decoration: none;">&lt;/td&gt;</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;right&quot;&gt;S -&amp;gt; E&lt;/td&gt;</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;td align=&quot;left&quot;&gt;</del>-&amp;gt;<del style="font-weight: bold; text-decoration: none;">&lt;/td&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;td align=&quot;left&quot;&gt;</del>E&lt;/td&gt;</div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;tr&gt;</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;right&quot;&gt;E<del style="font-weight: bold; text-decoration: none;">&lt;/td&gt;</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&lt;td align=&quot;right&quot;&gt;E -&amp;gt; E <ins style="font-weight: bold; text-decoration: none;">'''</ins>+<ins style="font-weight: bold; text-decoration: none;">''' </ins>E | E <ins style="font-weight: bold; text-decoration: none;">'''</ins>:=<ins style="font-weight: bold; text-decoration: none;">''' </ins>E | <ins style="font-weight: bold; text-decoration: none;">'''</ins>(<ins style="font-weight: bold; text-decoration: none;">''' </ins>E <ins style="font-weight: bold; text-decoration: none;">'''</ins>)<ins style="font-weight: bold; text-decoration: none;">''' </ins>| <ins style="font-weight: bold; text-decoration: none;">'''</ins>id<ins style="font-weight: bold; text-decoration: none;">'''</ins>&lt;/td&gt;</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;td align=&quot;left&quot;&gt;</del>-&amp;gt;<del style="font-weight: bold; text-decoration: none;">&lt;/td&gt;</del></div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;td align=&quot;left&quot;&gt;</del>E <del style="font-weight: bold; text-decoration: none;">      &lt;strong&gt;</del>+<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt; </del>E | E <del style="font-weight: bold; text-decoration: none;">      &lt;strong&gt;</del>:=<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt; </del>E | <del style="font-weight: bold; text-decoration: none;">      &lt;strong&gt;</del>(<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt; </del>E <del style="font-weight: bold; text-decoration: none;">      &lt;strong&gt;</del>)<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt; </del>| <del style="font-weight: bold; text-decoration: none;">      &lt;strong&gt;</del>id<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt;</del>&lt;/td&gt;</div></td><td colspan="2" class="diff-side-added"></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/table&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/table&gt;</div></td></tr> </table>

Root https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=9749&oldid=prev 2018-04-10T15:08:16Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:08, 10 April 2018</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l13">Line 13:</td> <td colspan="2" class="diff-lineno">Line 13:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/tr&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/table&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;/table&gt;</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;</del>Quando uma express&amp;atilde;o est&amp;aacute; a ser analisada &amp;eacute; necess&amp;aacute;rio diferenciar os casos onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; direita, daqueles onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; esquerda, do sinal de atribui&amp;ccedil;&amp;atilde;o. Note que n&amp;atilde;o &amp;eacute; poss&amp;iacute;vel atribuir um valor a uma express&amp;atilde;o. Por exemplo a express&amp;atilde;o <del style="font-weight: bold; text-decoration: none;">  &lt;strong&gt;</del>id + id := id<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt; </del>&amp;eacute; ilegal. No entanto, as express&amp;otilde;es <del style="font-weight: bold; text-decoration: none;">  &lt;strong&gt;</del>id := ( id + id )<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt;</del>, quer    <del style="font-weight: bold; text-decoration: none;">&lt;strong&gt;</del>id := ( id := id )<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt;</del>, ou ainda <del style="font-weight: bold; text-decoration: none;">  &lt;strong&gt;</del>( id ) := ( id := ( id + id ) )<del style="font-weight: bold; text-decoration: none;">&lt;/strong&gt; </del>s&amp;atilde;o autorizadas.<del style="font-weight: bold; text-decoration: none;">&lt;/span&gt;&lt;/p&gt;</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;</del>Considere que o operador ':=' &amp;eacute; menos priorit&amp;aacute;rio que o operador '+', al&amp;eacute;m de associativo &amp;agrave; direita, enquanto o operador '+' &amp;eacute; associativo &amp;agrave; esquerda.<del style="font-weight: bold; text-decoration: none;">&lt;/span&gt;&lt;/p&gt;</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Quando uma express&amp;atilde;o est&amp;aacute; a ser analisada &amp;eacute; necess&amp;aacute;rio diferenciar os casos onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; direita, daqueles onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; esquerda, do sinal de atribui&amp;ccedil;&amp;atilde;o. Note que n&amp;atilde;o &amp;eacute; poss&amp;iacute;vel atribuir um valor a uma express&amp;atilde;o. Por exemplo a express&amp;atilde;o <ins style="font-weight: bold; text-decoration: none;">'''</ins>id + id := id<ins style="font-weight: bold; text-decoration: none;">''' </ins>&amp;eacute; ilegal. No entanto, as express&amp;otilde;es <ins style="font-weight: bold; text-decoration: none;">'''</ins>id := ( id + id )<ins style="font-weight: bold; text-decoration: none;">'''</ins>, quer    <ins style="font-weight: bold; text-decoration: none;">'''</ins>id := ( id := id )<ins style="font-weight: bold; text-decoration: none;">'''</ins>, ou ainda <ins style="font-weight: bold; text-decoration: none;">'''</ins>( id ) := ( id := ( id + id ) )<ins style="font-weight: bold; text-decoration: none;">''' </ins>s&amp;atilde;o autorizadas.</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">&lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;</del>Escreva um esquema de tradu&amp;ccedil;&amp;atilde;o que usa um atributo herdado ( e nenhum sintetizado ) chamado <del style="font-weight: bold; text-decoration: none;">  &lt;tt&gt;</del>lado<del style="font-weight: bold; text-decoration: none;">&lt;/tt&gt; </del>associado ao s&amp;iacute;mbolo <del style="font-weight: bold; text-decoration: none;">  &lt;tt&gt;</del>E<del style="font-weight: bold; text-decoration: none;">&lt;/tt&gt;</del>, e que determina se a express&amp;atilde;o corrente est&amp;aacute; &amp;agrave; direita ou &amp;agrave; esquerda da atribui&amp;ccedil;&amp;atilde;o. O c&amp;oacute;digo associado &amp;agrave; gram&amp;aacute;tica emitir&amp;aacute; uma mensagem de erro caso a express&amp;atilde;o seja ilegal.<del style="font-weight: bold; text-decoration: none;">&lt;/span&gt;&lt;/p&gt;</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Considere que o operador <ins style="font-weight: bold; text-decoration: none;">''</ins>':=<ins style="font-weight: bold; text-decoration: none;">''</ins>' &amp;eacute; menos priorit&amp;aacute;rio que o operador <ins style="font-weight: bold; text-decoration: none;">''</ins>'+<ins style="font-weight: bold; text-decoration: none;">''</ins>', al&amp;eacute;m de associativo &amp;agrave; direita, enquanto o operador '+' &amp;eacute; associativo &amp;agrave; esquerda.</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Escreva um esquema de tradu&amp;ccedil;&amp;atilde;o que usa um atributo herdado (e nenhum sintetizado) chamado <ins style="font-weight: bold; text-decoration: none;">'''</ins>lado<ins style="font-weight: bold; text-decoration: none;">''' </ins>associado ao s&amp;iacute;mbolo <ins style="font-weight: bold; text-decoration: none;">'''</ins>E<ins style="font-weight: bold; text-decoration: none;">'''</ins>, e que determina se a express&amp;atilde;o corrente est&amp;aacute; &amp;agrave; direita ou &amp;agrave; esquerda da atribui&amp;ccedil;&amp;atilde;o. O c&amp;oacute;digo associado &amp;agrave; gram&amp;aacute;tica emitir&amp;aacute; uma mensagem de erro caso a express&amp;atilde;o seja ilegal.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Solution ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Solution ==</div></td></tr> </table>

Root https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=6101&oldid=prev 2015-04-06T14:25:33Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:25, 6 April 2015</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l19">Line 19:</td> <td colspan="2" class="diff-lineno">Line 19:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Solution ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Solution ==</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[category:<del style="font-weight: bold; text-decoration: none;">Compilers</del>]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[category:<ins style="font-weight: bold; text-decoration: none;">Compiladores</ins>]]</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[category:<del style="font-weight: bold; text-decoration: none;">Teaching</del>]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[category:<ins style="font-weight: bold; text-decoration: none;">Ensino</ins>]]</div></td></tr> </table>

Root https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=3579&oldid=prev 2010-04-25T15:44:18Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:44, 25 April 2010</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Problem (in Portuguese) ==</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;A gram&amp;aacute;tica seguinte admite atribui&amp;ccedil;&amp;otilde;es dentro de express&amp;otilde;es.&lt;/span&gt;&lt;/p&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;A gram&amp;aacute;tica seguinte admite atribui&amp;ccedil;&amp;otilde;es dentro de express&amp;otilde;es.&lt;/span&gt;&lt;/p&gt;</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>&lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;</div></td></tr> </table>

Root https://www.hlt.inesc-id.pt/~david/wiki/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=3140&oldid=prev 2009-04-18T15:16:07Z

<p>New page: &lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;A gramática seguinte admite atribuições dentro de expressões.&lt;/span&gt;&lt;/p&gt; &lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt; &lt;tr&gt; &lt;td align=&quot;right&quot;&gt;S&lt;/td&gt; &lt;td...</p> <p><b>New page</b></p><div>&lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;A gram&amp;aacute;tica seguinte admite atribui&amp;ccedil;&amp;otilde;es dentro de express&amp;otilde;es.&lt;/span&gt;&lt;/p&gt;<br /> &lt;table border=&quot;0&quot; cellpadding=&quot;3&quot;&gt;<br /> &lt;tr&gt;<br /> &lt;td align=&quot;right&quot;&gt;S&lt;/td&gt;<br /> &lt;td align=&quot;left&quot;&gt;-&amp;gt;&lt;/td&gt;<br /> &lt;td align=&quot;left&quot;&gt;E&lt;/td&gt;<br /> &lt;/tr&gt;<br /> &lt;tr&gt;<br /> &lt;td align=&quot;right&quot;&gt;E&lt;/td&gt;<br /> &lt;td align=&quot;left&quot;&gt;-&amp;gt;&lt;/td&gt;<br /> &lt;td align=&quot;left&quot;&gt;E &lt;strong&gt;+&lt;/strong&gt; E | E &lt;strong&gt;:=&lt;/strong&gt; E | &lt;strong&gt;(&lt;/strong&gt; E &lt;strong&gt;)&lt;/strong&gt; | &lt;strong&gt;id&lt;/strong&gt;&lt;/td&gt;<br /> &lt;/tr&gt;<br /> &lt;/table&gt;<br /> &lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;Quando uma express&amp;atilde;o est&amp;aacute; a ser analisada &amp;eacute; necess&amp;aacute;rio diferenciar os casos onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; direita, daqueles onde a express&amp;atilde;o est&amp;aacute; &amp;agrave; esquerda, do sinal de atribui&amp;ccedil;&amp;atilde;o. Note que n&amp;atilde;o &amp;eacute; poss&amp;iacute;vel atribuir um valor a uma express&amp;atilde;o. Por exemplo a express&amp;atilde;o &lt;strong&gt;id + id := id&lt;/strong&gt; &amp;eacute; ilegal. No entanto, as express&amp;otilde;es &lt;strong&gt;id := ( id + id )&lt;/strong&gt;, quer &lt;strong&gt;id := ( id := id )&lt;/strong&gt;, ou ainda &lt;strong&gt;( id ) := ( id := ( id + id ) )&lt;/strong&gt; s&amp;atilde;o autorizadas.&lt;/span&gt;&lt;/p&gt;<br /> &lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;Considere que o operador ':=' &amp;eacute; menos priorit&amp;aacute;rio que o operador '+', al&amp;eacute;m de associativo &amp;agrave; direita, enquanto o operador '+' &amp;eacute; associativo &amp;agrave; esquerda.&lt;/span&gt;&lt;/p&gt;<br /> &lt;p&gt;&lt;span lang=&quot;pt&quot;&gt;Escreva um esquema de tradu&amp;ccedil;&amp;atilde;o que usa um atributo herdado ( e nenhum sintetizado ) chamado &lt;tt&gt;lado&lt;/tt&gt; associado ao s&amp;iacute;mbolo &lt;tt&gt;E&lt;/tt&gt;, e que determina se a express&amp;atilde;o corrente est&amp;aacute; &amp;agrave; direita ou &amp;agrave; esquerda da atribui&amp;ccedil;&amp;atilde;o. O c&amp;oacute;digo associado &amp;agrave; gram&amp;aacute;tica emitir&amp;aacute; uma mensagem de erro caso a express&amp;atilde;o seja ilegal.&lt;/span&gt;&lt;/p&gt;<br /> <br /> == Solution ==<br /> <br /> [[category:Compilers]]<br /> [[category:Teaching]]</div>

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