https://robots.hlt.inesc-id.pt/w/pt/index.php?action=history&feed=atom&title=Attribute_Grammars%2FExercise_3%3A_Expressions
Attribute Grammars/Exercise 3: Expressions - Revision history
2026-05-24T06:41:42Z
Revision history for this page on the wiki
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https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=16347&oldid=prev
Root: /* Problem (in Portuguese) */
2024-05-02T09:59:08Z
<p><span class="autocomment">Problem (in Portuguese)</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<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 09:59, 2 May 2024</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"></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>== Problem (in Portuguese) ==</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>== Problem (in Portuguese) ==</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><p><span lang="pt">A gram&aacute;tica seguinte admite atribui&ccedil;&otilde;es dentro de express&otilde;es.</span></p></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><p><span lang="pt">A gram&aacute;tica seguinte admite atribui&ccedil;&otilde;es dentro de express&otilde;es.</span></p></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;"><table border="0" cellpadding="3"></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;"> </ins>S → E</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;"><tr></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;"> </ins>E → E + E | E := E | ( E ) | id</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;"><td align="left" style="padding-left: 100px;"></del>S → E<del style="font-weight: bold; text-decoration: none;"></td></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;"></tr></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;"><tr></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;"><td align="left" style="padding-left: 100px;"></del>E → E <del style="font-weight: bold; text-decoration: none;">'''</del>+<del style="font-weight: bold; text-decoration: none;">''' </del>E | E <del style="font-weight: bold; text-decoration: none;">'''</del>:=<del style="font-weight: bold; text-decoration: none;">''' </del>E | <del style="font-weight: bold; text-decoration: none;">'''</del>(<del style="font-weight: bold; text-decoration: none;">''' </del>E <del style="font-weight: bold; text-decoration: none;">'''</del>)<del style="font-weight: bold; text-decoration: none;">''' </del>| <del style="font-weight: bold; text-decoration: none;">'''</del>id<del style="font-weight: bold; text-decoration: none;">'''</td></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;"></tr></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;"></table></del></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;"><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>Quando uma express&atilde;o est&aacute; a ser analisada &eacute; necess&aacute;rio diferenciar os casos onde a express&atilde;o est&aacute; &agrave; direita, daqueles onde a express&atilde;o est&aacute; &agrave; esquerda, do sinal de atribui&ccedil;&atilde;o. Note que n&atilde;o &eacute; poss&iacute;vel atribuir um valor a uma express&atilde;o. Por exemplo a express&atilde;o '''id + id := id''' &eacute; ilegal. No entanto, as express&otilde;es '''id := ( id + id )''', quer '''id := ( id := id )''', ou ainda '''( id ) := ( id := ( id + id ) )''' s&atilde;o autorizadas.</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>Quando uma express&atilde;o est&aacute; a ser analisada &eacute; necess&aacute;rio diferenciar os casos onde a express&atilde;o est&aacute; &agrave; direita, daqueles onde a express&atilde;o est&aacute; &agrave; esquerda, do sinal de atribui&ccedil;&atilde;o. Note que n&atilde;o &eacute; poss&iacute;vel atribuir um valor a uma express&atilde;o. Por exemplo a express&atilde;o '''id + id := id''' &eacute; ilegal. No entanto, as express&otilde;es '''id := ( id + id )''', quer '''id := ( id := id )''', ou ainda '''( id ) := ( id := ( id + id ) )''' s&atilde;o autorizadas.</div></td></tr>
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Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=16346&oldid=prev
Root: /* Problem (in Portuguese) */
2024-05-02T09:58:31Z
<p><span class="autocomment">Problem (in Portuguese)</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<col class="diff-marker" />
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<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 09:58, 2 May 2024</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>
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<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><tr></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><tr></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><td align="left" style="padding-left: 100px;">S <del style="font-weight: bold; text-decoration: none;">-&gt; </del>E</td></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><td align="left" style="padding-left: 100px;">S <ins style="font-weight: bold; text-decoration: none;">→ </ins>E</td></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></tr></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></tr></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><tr></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><tr></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><td align="left" style="padding-left: 100px;">E <del style="font-weight: bold; text-decoration: none;">-&gt; </del>E '''+''' E | E ''':=''' E | '''(''' E ''')''' | '''id'''</td></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><td align="left" style="padding-left: 100px;">E <ins style="font-weight: bold; text-decoration: none;">→ </ins>E '''+''' E | E ''':=''' E | '''(''' E ''')''' | '''id'''</td></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></tr></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></tr></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></table></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></table></div></td></tr>
</table>
Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=11832&oldid=prev
Root: /* Solution */
2019-03-25T14:36:42Z
<p><span class="autocomment">Solution</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:36, 25 March 2019</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l17">Line 17:</td>
<td colspan="2" class="diff-lineno">Line 17:</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>
<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;"></ins></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><ins style="font-weight: bold; text-decoration: none;"> S -> E { E.lado = 'D'; }</ins></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><ins style="font-weight: bold; text-decoration: none;"> E<sub>1</sub> -> E<sub>2</sub> + E<sub>3</sub> { if (E<sub>1</sub>.lado == 'E') error(); else { E<sub>2</sub>.lado = 'D'; E<sub>3</sub>.lado = 'D'; } }</ins></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><ins style="font-weight: bold; text-decoration: none;"> E<sub>1</sub> -> E<sub>2</sub> := E<sub>3</sub> { if (E<sub>1</sub>.lado == 'E') error(); else { E<sub>2</sub>.lado = 'E'; E<sub>3</sub>.lado = 'D'; } }</ins></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><ins style="font-weight: bold; text-decoration: none;"> E<sub>1</sub> -> ( E<sub>2</sub> ) { E<sub>2</sub>.lado = E<sub>1</sub>.lado; }</ins></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><ins style="font-weight: bold; text-decoration: none;"> E -> id { /* nothing to do */ }</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;"><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>[[category:Compiladores]]</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>[[category:Compiladores]]</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>[[category:Ensino]]</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>[[category:Ensino]]</div></td></tr>
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Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=9751&oldid=prev
Root at 15:10, 10 April 2018
2018-04-10T15:10:27Z
<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:10, 10 April 2018</td>
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<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><tr></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><tr></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><td align="<del style="font-weight: bold; text-decoration: none;">right</del>">S -&gt; E</td></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><td align="<ins style="font-weight: bold; text-decoration: none;">left" style="padding-left: 100px;</ins>">S -&gt; E</td></div></td></tr>
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<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><tr></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><tr></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><td align="<del style="font-weight: bold; text-decoration: none;">right</del>">E -&gt; E '''+''' E | E ''':=''' E | '''(''' E ''')''' | '''id'''</td></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><td align="<ins style="font-weight: bold; text-decoration: none;">left" style="padding-left: 100px;</ins>">E -&gt; E '''+''' E | E ''':=''' E | '''(''' E ''')''' | '''id'''</td></div></td></tr>
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Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=9750&oldid=prev
Root: /* Problem (in Portuguese) */
2018-04-10T15:09:36Z
<p><span class="autocomment">Problem (in Portuguese)</span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:09, 10 April 2018</td>
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<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><tr></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><tr></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><td align="right">S<del style="font-weight: bold; text-decoration: none;"></td></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><td align="right">S -&gt; E</td></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;"><td align="left"></del>-&gt;<del style="font-weight: bold; text-decoration: none;"></td></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;"><td align="left"></del>E</td></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></tr></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></tr></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><tr></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><tr></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><td align="right">E<del style="font-weight: bold; text-decoration: none;"></td></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><td align="right">E -&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></td></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;"><td align="left"></del>-&gt;<del style="font-weight: bold; text-decoration: none;"></td></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;"><td align="left"></del>E <del style="font-weight: bold; text-decoration: none;"> <strong></del>+<del style="font-weight: bold; text-decoration: none;"></strong> </del>E | E <del style="font-weight: bold; text-decoration: none;"> <strong></del>:=<del style="font-weight: bold; text-decoration: none;"></strong> </del>E | <del style="font-weight: bold; text-decoration: none;"> <strong></del>(<del style="font-weight: bold; text-decoration: none;"></strong> </del>E <del style="font-weight: bold; text-decoration: none;"> <strong></del>)<del style="font-weight: bold; text-decoration: none;"></strong> </del>| <del style="font-weight: bold; text-decoration: none;"> <strong></del>id<del style="font-weight: bold; text-decoration: none;"></strong></del></td></div></td><td colspan="2" class="diff-side-added"></td></tr>
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Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=9749&oldid=prev
Root at 15:08, 10 April 2018
2018-04-10T15:08:16Z
<p></p>
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<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>
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<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></table></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></table></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;"><p><span lang="pt"></del>Quando uma express&atilde;o est&aacute; a ser analisada &eacute; necess&aacute;rio diferenciar os casos onde a express&atilde;o est&aacute; &agrave; direita, daqueles onde a express&atilde;o est&aacute; &agrave; esquerda, do sinal de atribui&ccedil;&atilde;o. Note que n&atilde;o &eacute; poss&iacute;vel atribuir um valor a uma express&atilde;o. Por exemplo a express&atilde;o <del style="font-weight: bold; text-decoration: none;"> <strong></del>id + id := id<del style="font-weight: bold; text-decoration: none;"></strong> </del>&eacute; ilegal. No entanto, as express&otilde;es <del style="font-weight: bold; text-decoration: none;"> <strong></del>id := ( id + id )<del style="font-weight: bold; text-decoration: none;"></strong></del>, quer <del style="font-weight: bold; text-decoration: none;"><strong></del>id := ( id := id )<del style="font-weight: bold; text-decoration: none;"></strong></del>, ou ainda <del style="font-weight: bold; text-decoration: none;"> <strong></del>( id ) := ( id := ( id + id ) )<del style="font-weight: bold; text-decoration: none;"></strong> </del>s&atilde;o autorizadas.<del style="font-weight: bold; text-decoration: none;"></span></p></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;"><p><span lang="pt"></del>Considere que o operador ':=' &eacute; menos priorit&aacute;rio que o operador '+', al&eacute;m de associativo &agrave; direita, enquanto o operador '+' &eacute; associativo &agrave; esquerda.<del style="font-weight: bold; text-decoration: none;"></span></p></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&atilde;o est&aacute; a ser analisada &eacute; necess&aacute;rio diferenciar os casos onde a express&atilde;o est&aacute; &agrave; direita, daqueles onde a express&atilde;o est&aacute; &agrave; esquerda, do sinal de atribui&ccedil;&atilde;o. Note que n&atilde;o &eacute; poss&iacute;vel atribuir um valor a uma express&atilde;o. Por exemplo a express&atilde;o <ins style="font-weight: bold; text-decoration: none;">'''</ins>id + id := id<ins style="font-weight: bold; text-decoration: none;">''' </ins>&eacute; ilegal. No entanto, as express&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&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;"><p><span lang="pt"></del>Escreva um esquema de tradu&ccedil;&atilde;o que usa um atributo herdado ( e nenhum sintetizado ) chamado <del style="font-weight: bold; text-decoration: none;"> <tt></del>lado<del style="font-weight: bold; text-decoration: none;"></tt> </del>associado ao s&iacute;mbolo <del style="font-weight: bold; text-decoration: none;"> <tt></del>E<del style="font-weight: bold; text-decoration: none;"></tt></del>, e que determina se a express&atilde;o corrente est&aacute; &agrave; direita ou &agrave; esquerda da atribui&ccedil;&atilde;o. O c&oacute;digo associado &agrave; gram&aacute;tica emitir&aacute; uma mensagem de erro caso a express&atilde;o seja ilegal.<del style="font-weight: bold; text-decoration: none;"></span></p></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>' &eacute; menos priorit&aacute;rio que o operador <ins style="font-weight: bold; text-decoration: none;">''</ins>'+<ins style="font-weight: bold; text-decoration: none;">''</ins>', al&eacute;m de associativo &agrave; direita, enquanto o operador '+' &eacute; associativo &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&ccedil;&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&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&atilde;o corrente est&aacute; &agrave; direita ou &agrave; esquerda da atribui&ccedil;&atilde;o. O c&oacute;digo associado &agrave; gram&aacute;tica emitir&aacute; uma mensagem de erro caso a express&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>
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Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=6101&oldid=prev
Root at 14:25, 6 April 2015
2015-04-06T14:25:33Z
<p></p>
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<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>
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<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>
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Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=3579&oldid=prev
Root at 15:44, 25 April 2010
2010-04-25T15:44:18Z
<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<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>
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<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><p><span lang="pt">A gram&aacute;tica seguinte admite atribui&ccedil;&otilde;es dentro de express&otilde;es.</span></p></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><p><span lang="pt">A gram&aacute;tica seguinte admite atribui&ccedil;&otilde;es dentro de express&otilde;es.</span></p></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><table border="0" cellpadding="3"></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><table border="0" cellpadding="3"></div></td></tr>
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Root
https://robots.hlt.inesc-id.pt/w/pt/index.php?title=Attribute_Grammars/Exercise_3:_Expressions&diff=3140&oldid=prev
Root: New page: <p><span lang="pt">A gramática seguinte admite atribuições dentro de expressões.</span></p> <table border="0" cellpadding="3"> <tr> <td align="right">S</td> <td...
2009-04-18T15:16:07Z
<p>New page: <p><span lang="pt">A gramática seguinte admite atribuições dentro de expressões.</span></p> <table border="0" cellpadding="3"> <tr> <td align="right">S</td> <td...</p>
<p><b>New page</b></p><div><p><span lang="pt">A gram&aacute;tica seguinte admite atribui&ccedil;&otilde;es dentro de express&otilde;es.</span></p><br />
<table border="0" cellpadding="3"><br />
<tr><br />
<td align="right">S</td><br />
<td align="left">-&gt;</td><br />
<td align="left">E</td><br />
</tr><br />
<tr><br />
<td align="right">E</td><br />
<td align="left">-&gt;</td><br />
<td align="left">E <strong>+</strong> E | E <strong>:=</strong> E | <strong>(</strong> E <strong>)</strong> | <strong>id</strong></td><br />
</tr><br />
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<p><span lang="pt">Quando uma express&atilde;o est&aacute; a ser analisada &eacute; necess&aacute;rio diferenciar os casos onde a express&atilde;o est&aacute; &agrave; direita, daqueles onde a express&atilde;o est&aacute; &agrave; esquerda, do sinal de atribui&ccedil;&atilde;o. Note que n&atilde;o &eacute; poss&iacute;vel atribuir um valor a uma express&atilde;o. Por exemplo a express&atilde;o <strong>id + id := id</strong> &eacute; ilegal. No entanto, as express&otilde;es <strong>id := ( id + id )</strong>, quer <strong>id := ( id := id )</strong>, ou ainda <strong>( id ) := ( id := ( id + id ) )</strong> s&atilde;o autorizadas.</span></p><br />
<p><span lang="pt">Considere que o operador ':=' &eacute; menos priorit&aacute;rio que o operador '+', al&eacute;m de associativo &agrave; direita, enquanto o operador '+' &eacute; associativo &agrave; esquerda.</span></p><br />
<p><span lang="pt">Escreva um esquema de tradu&ccedil;&atilde;o que usa um atributo herdado ( e nenhum sintetizado ) chamado <tt>lado</tt> associado ao s&iacute;mbolo <tt>E</tt>, e que determina se a express&atilde;o corrente est&aacute; &agrave; direita ou &agrave; esquerda da atribui&ccedil;&atilde;o. O c&oacute;digo associado &agrave; gram&aacute;tica emitir&aacute; uma mensagem de erro caso a express&atilde;o seja ilegal.</span></p><br />
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== Solution ==<br />
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[[category:Compilers]]<br />
[[category:Teaching]]</div>
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