编译原理词法分析程序源代码C++版本.doc

/*实验1 词法分析源码已经通过VS2010调试，亲测可用，有打开文件操作（在工程文件夹里建一个program.txt，输入程序串即可）。也可从键盘直接输入源码，后面的语法分析也能用的上，欢迎使用。*/#include#include #includeusing namespace std;void KeyFunction();void ReadTxt();void main() int choose;cout(1,2)choose;if(choose=1)cout请输入程序段:以 # 结束：=a&b=A&b=a&b=A&b=0&b=9) di+=b; b=getchar();for(j=0;j12;j+)/*查询保留字表确定该单词是否是保留字*/ if(strcmp(d,aj)=0) cout关键字dendl; k=1; break;if(k=0)/*在保留字表中没有查到该单词，是标识符*/ cout标识符dendl;for(j=0;j=0&b=0&b=0&b=0&b=0&b=0&b=0&b=9) state=6;di+=b;b=getchar(); else state=7; break; case 7: f=1;break; case 8: f=1;break; if(state=7&(bz)&(bZ) cout数字d=a&b=A&b=a&b=A&b=Z) di+=b; b=getchar(); couterror line!endl; else couterror line!endl; for(j=0;j=i;j+)dj=0; i=0; f=0; state=1; else if(b=)/*识别、=和*/ di+=b; b=getchar(); if(b=|b=) di+=b; b=getchar(); cout运算符dendl; for(j=0;j=i;j+) dj=0; i=0; else cout运算符dendl; for(j=0;j)/*识别和=*/ di+=b; b=getchar(); if(b=) di+=b; b=getchar(); cout运算符dendl; for(j=0;j=i;j+) dj=0; i=0; else cout运算符dendl; for(j=0;j=i;j+) dj=0; i=0; else if(b=:)/*识别:=*/ di+=b; b=getchar(); if(b=) di+=b; b=getchar(); cout符号dendl; else couterror line!endl; for(j=0;j=i;j+) dj=0; i=0; else if(b=*|b=+|b=-|b=/|b=)/*识别运算符*/ cout运算符bendl; b=getchar(); else if(b=(|b=)|b=,|b=;|b=.)/*识别分隔符*/ cout分隔符bendl; b=getchar(); else couterror line!=a&b=A&b=a&b=A&b=0&b=9) di+=b; b=out.get();for(j=0;j12;j+)/*查询保留字表确定该单词是否是保留字*/ if(strcmp(d,aj)=0) cout关键字dendl; k=1; break;if(k=0)/*在保留字表中没有查到该单词，是标识符*/ cout标识符dendl;for(j=0;j=0&b=0&b=0&b=0&b=0&b=0&b=0&b=9) state=6;di+=b;b=out.get(); else state=7; break; case 7: f=1;break; case 8: f=1;break; if(state=7&(bz)&(bZ) cout数字d=a&b=A&b=a&b=A&b=Z) di+=b; b=out.get(); couterror line!endl; else couterror line!endl; for(j=0;j=i;j+)dj=0; i=0; f=0; state=1; else if(b=)/*识别、=和*/ di+=b; b=out.get(); if(b=|b=) di+=b; b=out.get(); cout运算符dendl; for(j=0;j=i;j+) dj=0; i=0; else cout运算符dendl; for(j=0;j)/*识别和=*/ di+=b; b=out.get(); if(b=) di+=b; b=out.get(); cout运算符dendl; for(j=0;j=i;j+) dj=0; i=0; else cout运算符dendl; for(j=0;j=i;j+) dj=0; i=0; else if(b=:)/*识别:=*/ di+=b; b=out.get(); if(b=) di+=b; b=out.get(); cout符号dendl; else couterror line!endl; for(j=0;j=i;j+) dj=0; i=0; else if(b=*|b=+|b=-|b=/|b=)/*识别运算符*/ cout运算符bendl; b=out.get(); else if(b=(|b=)|b=,|b=;|b=.)/*识别分隔符*/ cout分隔符bendl;