燕山大学编译原理实验报告.doc

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编译原理实验报告





所在学院：

所在班级：

学生姓名：______ _

学号：__

指导教师：

教务处

实验一词法分析程序

、实验目的：设计、编制和调试一个具体的词法分析程序，加深对词法分析的理解。

、要求：

（）通过对  词法分析程序的分析，编制一个具有以下功能的词法

分析程序：

>'344CC&34D4//'34,4CC&34E4

$$)



$>)

判断是否是数字

F(2%(

>%('344CC%(&34G4

$$)



$>)

词法分析

=%6DHI.>



?223>(>J3KH:

>23344//2334L4//2334L4:@空格回车

>2:首是字母

258!93:4L4@)

3)

?22//F(2:后面是字母或者数字

58932)

BB)

23>(>)

@

回退一个指针

>5><M<ANO)

>A65:

关键字

$&&5&&;LL;&&;L 关键字;&&%)

@

:

标识符

$&&5&&;LL";&&;L 标识符;&&%)

@

@

>F(2//23344首是数字或者点

:

53$)

3)

25893:4L4@)

?2F(2//2//23344CCF(>(>

:

>2

53>)

>23344>5><M<ANO)

58932)

BB)

23>(>)

:

>23344>5><M<ANO)

58932)

BB)

23>(>)

@

>5><M<ANO)

属于无符号常数

>5

$&&5&&;LL0;&&;L 常数;&&%)



$&&5&&;LLP;&&;L 错误的标识符;&&%)



@

?22:

运算符

4B4Q:

23>(>)

>2334B4$&&;BB;&&;LL;&&;L 运算符;&&%)

:

$&&;B;&&;LL;&&;L 运算符;&&%)

>5><M<ANO)

@

@ 5)

4M4Q:

23>(>)

>2334M4$&&;MM;&&;LL;&&;L 运算符;&&%)

:

$&&;M;&&;LL;&&;L 运算符;&&%)

>5><M<ANO)

@

@ 5)

4.4Q$&&2&&;LL;&&;L 运算符;&&%) 5)

44Q$&&2&&;LL;&&;L 运算符;&&%) 5)

分界符

4L;4Q$&&2&&;LL;&&;L 分界符;&&%) 5)

44Q$&&2&&;LL!;&&;L 分界符;&&%) 5)

44Q$&&2&&;LL!;&&;L 分界符;&&%) 5)

484Q$&&2&&;LL!;&&;L 分界符;&&%) 5)

494Q$&&2&&;LL!;&&;L 分界符;&&%) 5)

4)4Q$&&2&&;LL!;&&;L 分界符;&&%) 5)

4:4Q$&&2&&;LL!;&&;L 分界符;&&%) 5)

4@4Q$&&2&&;LL!;&&;L 分界符;&&%) 5)

运算符

434Q:

23>(>)

>233434$&&;33;&&;LL;&&;L 运算符;&&%)

:

$&&;3;&&;LL;&&;L 运算符;&&%)

>5><M<ANO)

@

@ 5)

4#4Q:

23>(>)

>233434$&&;#3;&&;LL;&&;L 运算符;&&%)

:

$&&;#;&&;LL;&&;L 运算符;&&%)

>5><M<ANO)

@ 5)

4Q4Q:

23>(>)

>233434$&&;Q3;&&;LL;&&;L 运算符;&&%)

:

$&&;Q;&&;LL;&&;L 运算符;&&%)

>5><M<ANO)

@

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