📄 4.10.6.htm
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<title>4.6的解答</title>
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<center><font class="title2"><b>练习4.6</b></font></center><br>
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解：<br>
从练习4.1得到文法的产生式如下：<br>
R → R '|' T | T <br>
T → TF | F <br>
F → F* | C <br>
C → (R)| a | b <br>
①消除上面文法中的左递归<br>
<table align=center width=450 class="content">
<tr><td>R → TR' </td><td>R' → '|' TR' | ε</td></tr>
<tr><td>T → FT' </td><td>T' → FT' | ε</td></tr>
<tr><td>F → CF' </td><td>F → *F' | ε</td></tr>
<tr><td>C → (R) | a | b</td><td></td></tr>
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②计算FIRST(α)和FOLLOW(A)<br>
<center><img src="images/ex4.61.gif"></center><br>
③构造LL(1)分析表。<br>
<center><img src="images/ex4.62.gif"></center><br>
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