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<font class="title2"><b>练习</b></font>
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 6.5 (a) 对以下的Pascal程序画出过程c第二次被激活时的运行栈，控制链和存取链。说明在c中如何访问变量x。<br>                                    
&nbsp;&nbsp;&nbsp; (b) 把存取链改成DISPLAY表，重做(a).<p><b><font color="#0000FF">program</font></b> env；<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<b><font color="#0000FF">procedure</font></b> a；<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<font color="#0000FF"><b>var</b></font> x:integer；<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<font color="#0000FF"><b>procedure</b></font>                   
b；<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><font color="#0000FF">procedure</font></b> c；<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<font color="#0000FF"><b>begin</b></font> x:=2；b <font color="#0000FF"><b> end</b></font>；<font color="#008000">{procedure c}</font><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<b><font color="#0000FF">begin</font></b> c <font color="#0000FF"><b> end</b></font>；<font color="#008000">{procedure b}</font><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<b><font color="#0000FF">begin</font></b>               
b <font color="#0000FF"><b> end</b></font>；<font color="#008000">{procedure a}</font>&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
<b><font color="#0000FF">begin</font></b> a <b><font color="#0000FF">end</font></b>. 
<font color="#008000">            
{main}</font>&nbsp;&nbsp;</p>  
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6.6 一个Pascal语言程序在执行到某一时刻时，其活动记录和DISPLAY表如下所示：                   
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<p >(a) 试问此时正在执行的调用有哪些（用→表示调用）？<br>&nbsp;&nbsp;&nbsp;         
(b) 指出P,Q,R,S它们之间的嵌套关系。</p>        
                
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