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📄 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
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mso-char-indent-size:10.5pt;line-height:150%'><span lang=EN-US>&lt;</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>&gt;</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>CONST&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>常量定义</span><span lang=EN-US>&gt;{</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>&lt;</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>常量定义</span><span
lang=EN-US>&gt;}</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
style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </span></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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>常量定义</span><span lang=EN-US>&gt;</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><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"'>无符号整数</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>&lt;</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>&gt;</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>VAR&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>变量定义</span><span lang=EN-US>&gt;(</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>&lt;</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>变量定义</span><span
lang=EN-US>&gt;)</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>变量定义</span><span lang=EN-US>&gt;</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><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"'>，标识符</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>类型</span><span lang=EN-US>&gt;</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>类型</span><span lang=EN-US>&gt;</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>INTEGER|LONG</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>&lt;</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>&gt;</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>&lt;</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>过程首部</span><span
lang=EN-US>&gt;&lt;</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>&gt;</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>{&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>过程首部</span><span lang=EN-US>&gt;&lt;</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>&gt;</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></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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>过程首部</span><span lang=EN-US>&gt;</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>PROCEDURE</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><span lang=EN-US>| PROCEDURE</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><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"'>标识符：</span><span
lang=EN-US>&lt;</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>类型</span><span lang=EN-US>&gt;)</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>语句</span><span lang=EN-US>&gt;</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>&lt;</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>赋值语句</span><span lang=EN-US>&gt;|&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>条件语句</span><span lang=EN-US>&gt;|&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>当型循环语句</span><span lang=EN-US>&gt;|&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>过程调用语句</span><span lang=EN-US>&gt;</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>|&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>读语句</span><span lang=EN-US>&gt;|&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>写语句</span><span lang=EN-US>&gt;|&lt;</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>&gt;|</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>ε</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>赋值语句</span><span lang=EN-US>&gt;</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><span lang=EN-US>=&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>表达式</span><span lang=EN-US>&gt;</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>条件语句</span><span lang=EN-US>&gt;</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>IF&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>条件</span><span lang=EN-US>&gt;THEN&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>语句</span><span lang=EN-US>&gt;</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>当型循环语句</span><span lang=EN-US>&gt;</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>WHILE&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>条件</span><span lang=EN-US>&gt;DO&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>语句</span><span lang=EN-US>&gt;</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>过程调用语句</span><span lang=EN-US>&gt;</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><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"'>标识符</span><span lang=EN-US>(&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>表达式</span><span lang=EN-US>&gt;)</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>读语句</span><span lang=EN-US>&gt;</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>READ(</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><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"'>标识符</span><span lang=EN-US>})</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>写语句</span><span lang=EN-US>&gt;</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>WRITE(&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>表达式</span><span lang=EN-US>&gt;{</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>&lt;</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>表达式</span><span
lang=EN-US>&gt;})</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>&lt;</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>&gt;</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>BEGIN&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>语句</span><span lang=EN-US>&gt;{</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>&lt;</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>语句</span><span
lang=EN-US>&gt;}END</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>条件</span><span lang=EN-US>&gt;</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>&lt;</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>表达式</span><span lang=EN-US>&gt;&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>关系运算符</span><span lang=EN-US>&gt;&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>表达式</span><span lang=EN-US>&gt; | ODD&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>表达式</span><span lang=EN-US>&gt;</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>&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>表达式</span><span lang=EN-US>&gt;</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>[+|-]&lt;</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
12345

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