📄 a_5.6.htm

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<title>5.6的解答</title>
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<body background="../../images/background.gif" >
<center><font class="title2"><b>练习5.6</b></font></center><br>
<p>解答:&nbsp;</p>   


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<td width = "30%"><div align = center>产生式</div></td>
<td width = "70%"><div align = center>语义规则</div></td>
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D -&gt; D<sub>1</sub>,id      
	
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<td >
	
D.type:=D<sub>1</sub>.type;
<p>addtype(id.entry,D<sub>1</sub>.type);   
 
	
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<td >
	
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; D -&gt; T id  
	
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D.type:=T.type;
<p>addtype(id.entry,T.type);</p>
	
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; T -&gt; int  
	
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T.type:=int;
	
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; T -&gt; real  
	
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T.type:=real;
	
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<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </p> 



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