📄 词法分析程序.htm
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<title>实验一 词法分析程序</title>
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<body lang=ZH-CN style='tab-interval:21.0pt;text-justify-trim:punctuation'>
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<p class=MsoNormal align=center style='text-align:center;line-height:150%'><b><span
style='font-size:14.0pt;mso-bidi-font-size:12.0pt;font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>实验一</span></b><b><span
lang=EN-US style='font-size:14.0pt;mso-bidi-font-size:12.0pt'><span
style="mso-spacerun: yes"> </span></span></b><b><span style='font-size:
14.0pt;mso-bidi-font-size:12.0pt;font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>词法分析程序</span></b><b><span lang=EN-US
style='font-size:14.0pt;mso-bidi-font-size:12.0pt'><o:p></o:p></span></b></p>
<p class=MsoNormal style='line-height:20.0pt;mso-line-height-rule:exactly'><b><span
lang=EN-US style='font-size:12.0pt'><![if !supportEmptyParas]> <![endif]><o:p></o:p></span></b></p>
<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"'>一、目的和内容</span></b><b><span lang=EN-US style='font-size:12.0pt'><o:p></o:p></span></b></p>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US><span
style="mso-spacerun: yes"> </span>1</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>．实验目的：通过完成词法分析程序，了解词法分析的过程。</span></p>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US><span
style="mso-spacerun: yes"> </span>2</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>．实验内容：用</span><span lang=EN-US>C</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>／</span><span lang=EN-US>C++</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>实现对</span><span
lang=EN-US>Pascal</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的子集程序设计语言的词法识别程序。</span></p>
<p class=MsoNormal style='line-height:150%'><span lang=EN-US><span
style="mso-spacerun: yes"> </span>3</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>．实验要求：将该语言的源程序，也就是相应字符流转换成内码，并根据需要是否对于标识符填写相应的符号表供编译程序的以后各阶段使用。</span></p>
<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"'>二、程序设计语言的描述</span></b></p>
<p class=MsoNormal style='text-indent:27.0pt;mso-char-indent-count:2.57;
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"'>程序设计语言的描述采用扩充的</span><span
lang=EN-US>BNF</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>表示：</span></p>
<p class=MsoNormal style='text-indent:27.0pt;mso-char-indent-count:2.57;
mso-char-indent-size:10.5pt;line-height:150%'><span lang=EN-US><</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>程序</span><span lang=EN-US>></span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>→</span><span
lang=EN-US><</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>程序首部</span><span lang=EN-US>><</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>分程序</span><span lang=EN-US>></span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>．</span></p>
<p class=MsoNormal style='text-indent:27.0pt;mso-char-indent-count:2.57;
mso-char-indent-size:10.5pt;line-height:150%'><span lang=EN-US><</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>程序首部</span><span lang=EN-US>></span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>→</span><span lang=EN-US>PROGRAM</span><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>
<p class=MsoNormal style='text-indent:27.0pt;mso-char-indent-count:2.57;
mso-char-indent-size:10.5pt;line-height:150%'><span lang=EN-US><</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>分程序</span><span lang=EN-US>></span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>→</span><span lang=EN-US>[<</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>常量说明部分</span><span
lang=EN-US>>][<</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>变量说明部分</span><span
lang=EN-US>>][<</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>过程说明部分</span><span
lang=EN-US>>]<</span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>复合语句</span><span
lang=EN-US>></span></p>
<p class=MsoNormal style='text-indent:27.0pt;mso-char-indent-count:2.57;
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