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📄 8.8.0b.htm

📁 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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<p><br>
<br>
<font class="title2"><b>练习</b></font> </p>

<table width=100%>
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    <td>&nbsp;&nbsp;&nbsp;&nbsp;</td>
    <td class="content">
    <a name=8.5></a>
    8.5 为下列C程序生成目标代码。<br>
    &nbsp;&nbsp;&nbsp;&nbsp;main()<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int i;<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;int a[10];<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;while(i&lt;=10) <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a[i]=0; 
    <br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} </p>
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    <a name=8.6></a>
    <hr size="2" align="center" color="red">
    <p><br>
    8.6 为下列赋值语句生成目标代码。<br>
    (a)&nbsp;&nbsp;&nbsp;&nbsp;x:=a+b*c<br>
    (b)&nbsp;&nbsp;&nbsp;&nbsp;x:=(a*-b)+(c-(d+e))<br>
    (c)&nbsp;&nbsp;&nbsp;&nbsp;x:=(a/b-c)/d<br>
    (d)&nbsp;&nbsp;&nbsp;&nbsp;x:=a+(b+c/d*e)/(f*g-h*i)<br>
    (e)&nbsp;&nbsp;&nbsp; a[i,j]:=b[i,j]-c[a[k,l]]*d[i+j] </p>
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    <a name=8.7></a>
    <hr size="2" align="center" color="red">
    <p><br>
    8.7 为下列基本块构造dag: </p>
    <p align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    d := b*c</p>
    <p align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    e := a+b</p>
    <p align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    b := b*c</p>
    <p align="left">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
    a := e-d<br>
    </p>
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