词法分析程序.htm

语法分析程序 必须先编写一个program的文本文件 再对该文本文件的程序进行语法分析

  lang=EN-US>22</span></p>
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  lang=EN-US>&lt;</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>23</span></p>
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  lang=EN-US>&lt;=</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>24</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>&gt;</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>25</span></p>
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  <td width=98 style='width:73.2pt;border-top:none;border-left:none;border-bottom:
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  lang=EN-US>&gt;=</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>26</span></p>
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  lang=EN-US>.</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>27</span></p>
  </td>
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  lang=EN-US>.</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>28</span></p>
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  lang=EN-US>;</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>29</span></p>
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  <td width=98 style='width:73.2pt;border-top:none;border-left:none;border-bottom:
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  lang=EN-US>:</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>30</span></p>
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  lang=EN-US>:=</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>31</span></p>
  </td>
  <td width=69 style='width:51.9pt;border-top:none;border-left:none;border-bottom:
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>(</span></p>
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  <td width=69 style='width:51.95pt;border-top:none;border-left:none;
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>32</span></p>
  </td>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>)</span></p>
  </td>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>33</span></p>
  </td>
  <td width=98 style='width:73.2pt;border-top:none;border-left:none;border-bottom:
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  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>无符号整数</span></p>
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>34</span></p>
  </td>
  <td width=69 style='width:51.9pt;border-top:none;border-left:none;border-bottom:
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
  "Times New Roman"'>标识符</span></p>
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  <td width=69 style='width:51.9pt;border-top:none;border-left:none;border-bottom:
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>35</span></p>
  </td>
  <td width=69 style='width:51.9pt;border-top:none;border-left:none;border-bottom:
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  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><span
  lang=EN-US>#</span></p>
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  padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><![if !supportEmptyParas]>&nbsp;<![endif]><span
  lang=EN-US><o:p></o:p></span></p>
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  <td width=69 style='width:51.95pt;border:none;border-bottom:solid windowtext .5pt;
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  padding:0cm 5.4pt 0cm 5.4pt'>
  <p class=MsoNormal align=center style='text-align:center;line-height:150%'><![if !supportEmptyParas]>&nbsp;<![endif]><span
  lang=EN-US><o:p></o:p></span></p>
  </td>
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<p class=MsoNormal style='line-height:150%'><span lang=EN-US><![if !supportEmptyParas]>&nbsp;<![endif]><o:p></o:p></span></p>

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<p class=MsoNormal style='line-height:150%'><b><span style='font-size:12.0pt;
font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>四、词法分析程序的设计思想</span></b></p>

<p class=MsoNormal style='text-indent:21.0pt;mso-char-indent-count:2.0;
mso-char-indent-size:10.5pt;line-height:150%'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>为了实现的编译程序实用，这里规定源程序可采用自由书写格式，即一行内可以书写多个语句，一个语句也可以占领多行书写；标识符的前</span><span
lang=EN-US>20</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>个字符有效；整数用</span><span lang=EN-US>2</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>个字节表示；长整数用</span><span lang=EN-US>4</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>个字节表示。这样词法分析程序的主要工作为：</span></p>

<p class=MsoNormal style='line-h