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📁 建立《编译原理网络课程》的目的不仅使学生掌握构造编译程序的原理和技术
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<title>编译原理</title>
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<font class="title2"><b>练习</b></font>
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<a name="9.1"></a>9.1 试构造下面的程序的流图，并找出其中所有回边及循环。<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">read</font> P<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; x := 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c := P * P<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">if</font> c &lt; 100
<font color="#0000FF">goto</font> 
L1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B := P * P<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; x := x + 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B := B + x<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">write</font> x<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">
halt</font><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; L1: B:= 10<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; x := x + 2<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B := B + x<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">write</font> B<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">if
</font>B &lt; 100 <font color="#0000FF">goto</font> 
L2<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">halt</font><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; L2: x := x + 1<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <font color="#0000FF">goto</font> L1<table align=center width=70%>
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<a name="9.2"></a>
<hr size=2 align=center color=red><br>

9.2 对本题中所示的流图，求出其各结点n的控制结点集D(n)、回边及循环（n<sub>0</sub>为首结点）。<br>
<p align = "center"><img src="images/e9.2a.gif" width="126" height="326"></p>
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