?? 9.5.5_2.htm
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<p> 計算圖２（b）的in和out </p>
<p><span style="FONT-SIZE: large">
<img border="0" src="images/9_25_2.gif" align="left" ></span><b><font size="4">in[S1]=in[S]
</font></b>
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<p><b><font size="4">in[S2]=out[S1] </font></b> </p>
<p><b><font size="4">out[S]=out[S2] </font></b> </p>
<p>解析：這是串聯語句S1、S2，我們由in[S1]=in[S]開始，然后遞歸計算out[S1]，它給出了in[S2]，因為一個定值到達S2的開始點，當且僅當它到達S1的結束點，再遞歸地計算out[S2]，這個集合等于out[S]。
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