编译原理实验报告-词法分析器

1、编译原理实验报告姓名：关海超学号：200807010209专业：计算机科学与技术班级：0802班 intline=1;introw=1;/记录当前行数,初始化为1intline=1;introw=1;/记录当前列数,初始化为1for(i=0;ilen;i+)ch=progi;j=0;if(ch=)|(ch=t)/空格或水平制表(即tab键)continue;if(ch=n)line+;scanedChars=i;continue;if(isalpha(ch)/ch是字母while(isalpha(progi)|isdigit(progi)tokenj+=progi;i+;tokenj=0;i-

2、;print(token);/continue;elseif(isdigit(ch)/ch是数字while(isdigit(progi)tokenj+=progi;i+;tokenj=0;i-;print(token);continue;else/ch是符号chart;switch(ch)case*:tokenj+=ch;t=prog+i;if(t=)tokenj+=t;elsei-;tokenj=0;print(token);break;case/:tokenj+=ch;t=prog+i;if(t=)tokenj+=t;else/if(t=/)/双斜杠注释符while(prog+i!=n);

3、continue;elseif(t=*)/*/注释符intflag=0;while(i+2)tokenj+=t;elseif(t=-)tokenj+=t;elseif(t=)tokenj+=t;elsei-;tokenj=0;print(token);break;case&:tokenj+=ch;t=prog+i;if(t=&)tokenj+=t;elseif(t=)tokenj+=t;elsei-;tokenj=0;print(token);break;case|:tokenj+=ch;t=prog+i;if(t=|)tokenj+=t;elseif(t=)tokenj+=t;elsei-;

4、tokenj=0;print(token);break;case:tokenj+=ch;t=prog+i;if(t=)tokenj+=t;elseif(t=:tokenj+=ch;t=prog+i;if(t=)tokenj+=t;elseif(t=)tokenj+=t;t=prog+i;if(t=)tokenj+=t;elsei-;elsei-;tokenj=0;print(token);break;case(:tokenj+=ch;tokenj=0;print(token);break;case):tokenj+=ch;tokenj=0;print(token);break;case:tok

5、enj+=ch;tokenj=0;print(token);break;case:tokenj+=ch;tokenj=0;print(token);break;case:tokenj+=ch;tokenj=0;print(token);break;case:tokenj+=ch;tokenj=0;print(token);break;case.:tokenj+=ch;tokenj=0;print(token);break;case_:tokenj+=ch;tokenj=0;print(token);break;case:tokenj+=ch;tokenj=0;print(token);brea

6、k;case,:tokenj+=ch;tokenj=0;print(token);break;case34:tokenj+=ch;tokenj=0;print(token);break;case:tokenj+=ch;tokenj=0;print(token);break;case;:tokenj+=ch;tokenj=0;print(token);break;case:tokenj+=ch;tokenj=0;print(token);break;case:tokenj+=ch;tokenj=0;print(token);break;default:printf(Erroratline:%dn,line);printf(Erroratrow:%dn,i-scanedChars);p