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1、报告成绩实验报告项目名称PL/0语言的扩充学院计算机学院专业班级09软件工程1班学号3109006291姓名姚振威指导教师李小妹程序功能完成情况测试用例全面程度学生对所编程序熟悉程度报告格式是否与要求相符报告内容是否准确、全面2011年12月28日实验一：增加单词一、实验目的与要求在分析理解一个教学型编译程序（如PL/0）的基础上，对其词法分析程序。二、实验内容增加单词：保留字ELSE，FOR，TO，DOWNTO，RETURN运算符+=，-=，++，--，&,
2、,!实验平台（1）计算机及操作系统：PC机，Windows7（2）程序设计语言
3、：C++Builder（3）集成环境：C++Builder（4）教学型编译程序：PL/0三、设计方法首先要扩展SYMBOL，在此基础上再进行其它细节的修改。要添加的SYMBOL为：typedefenum{NUL,IDENT,NUMBER,PLUS,MINUS,TIMES,SLASH,ODDSYM,EQL,NEQ,LSS,LEQ,GTR,GEQ,LPAREN,RPAREN,COMMA,SEMICOLON,PERIOD,BECOMES,BEGINSYM,ENDSYM,IFSYM,THENSYM,WHILESYM,WRITESYM,READSY
4、M,DOSYM,CALLSYM,CONSTSYM,VARSYM,PROCSYM,PROGSYM,,ELSESYM,FORSYM,TOSYM,DOWNTOSYM,RETURNSYM,PLUSBECOMES,MINUSBECOMES,DPLUS,DMINUS,AND,OR,NOT}SYMBOL;char*SYMOUT[]={"NUL","IDENT","NUMBER","PLUS","MINUS","TIMES","SLASH","ODDSYM","EQL","NEQ","LSS","LEQ","GTR","GEQ","LPAREN","RP
5、AREN","COMMA","SEMICOLON","PERIOD","BECOMES","BEGINSYM","ENDSYM","IFSYM","THENSYM","WHILESYM","WRITESYM","READSYM","DOSYM","CALLSYM","CONSTSYM","VARSYM","PROCSYM","PROGSYM","ELSESYM","FORSYM","TOSYM","DOWNTOSYM","RETURNSYM","PLUSBECOMES","MINUSBECOMES","DPLUS","DMINUS","A
6、ND","OR","NOT"};其中红斜体为新加入的SYMBOL。再将"ELSESYM","FORSYM","TOSYM","DOWNTOSYM","RETURNSYM","PLUSBECOMES","MINUSBECOMES","DPLUS","DMINUS"关键字加到KWORD和将相应的SYM加到WSYM，按字母顺序排列。以及修改NEQ后如下for(CH='';CH<='^';CH++)SSYM[CH]=NUL;strcpy(KWORD[1],"BEGIN");strcpy(KWORD[2],"CALL");strcpy(KWORD[
7、3],"CONST");strcpy(KWORD[4],"DO");strcpy(KWORD[5],"DOWNTO");strcpy(KWORD[6],"ELSE");strcpy(KWORD[7],"END");strcpy(KWORD[8],"FOR");strcpy(KWORD[9],"IF");strcpy(KWORD[10],"ODD");strcpy(KWORD[11],"PROCEDURE");strcpy(KWORD[12],"PROGRAM");strcpy(KWORD[13],"READ");strcpy(KWORD[
8、14],"RETURN");strcpy(KWORD[15],"THEN");strcpy(KWORD[16],"TO");strcpy(KWORD[17],"VAR");strcpy(KWORD[18],"WHILE");strcpy(KWORD[19],"WRITE");WSYM[1]=BEGINSYM;WSYM[2]=CALLSYM;WSYM[3]=CONSTSYM;WSYM[4]=DOSYM;WSYM[5]=DOWNTOSYM;WSYM[6]=ELSESYM;WSYM[7]=ENDSYM;WSYM[8]=FORSYM;WSYM[9
9、]=IFSYM;WSYM[10]=ODDSYM;WSYM[11]=PROCSYM;WSYM[12]=PROGSYM;WSYM[13]=READSYM;WSYM[14]=RETURNSYM;WS
