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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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<td width="60%" height=30 align=center>说明</td>
<td width="40%" align=center>作用域</td>
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<td align=left>
	<p>int a = 0;</p> 
	<p>int b = 0;</p>
	<p>int b = 1;</p>
	<p>int a = 2;</p>
	<p>int b = 3;</p>	
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      <br>
      <p><center>B<sub>0</sub>-B<sub>2</sub></center></p>
      <p><center>B<sub>0</sub>-B<sub>1</sub></center></p>
      <p><center>B<sub>1</sub>-B<sub>3</sub></center></p>
      <p><center>B<sub>2</sub></center></p>
      <p><center>B<sub>3</sub></center></p>	
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<td width="90%">
	rain()<br>
	{<br>
	:&nbsp&nbsp&nbsp&nbspint a = 0;<br> 
	:&nbsp&nbsp&nbsp&nbspint b = 0;<br> 
	:&nbsp&nbsp&nbsp&nbsp{<br>
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbspint b = 1;<br> 
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbsp{<br>
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbsp... int a = 2;<br> 
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbspB<sub>2</sub> printf("%d%d\n",a,b); (印出十进制数a,b并换行)<br> 
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbsp...<br>
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbsp}<br>
	B<sub>0</sub>&nbsp&nbsp&nbspB<sub>1</sub>&nbsp&nbsp{<br>
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbsp...<br>
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbspB<sub>3</sub> int b = 3;<br> 
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbsp... printf("%d%d\n",a,b);<br> 
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbsp}<br>
	:&nbsp&nbsp&nbsp&nbsp:&nbsp&nbsp&nbsp&nbspprintf("%d%d\n",a,b);<br>
	:&nbsp&nbsp&nbsp&nbsp}<br>
	:&nbsp&nbsp&nbsp&nbspprintf("%d%d\n",a,b);<br>
	}<br>
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<p><center><b>图6.15</b> &nbsp在一个C程序中的块</center></p><br> 
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