詞法分析.doc

#include#include#include#includeusing namespace std;const int N=60;string keyN=bool,char,class,double,enum,float,int,long,short,signed,struct,union,unsigned,void,volatile,wchar_t,auto,extern,inline,register,static,friend,private,protected,public,break,case,catch,continue,default,do,else,for,goto,if,return,switch,throw,try,while,delete,false,new,sizeof,true,asm,explicit,namespace,operator,template,this,typedef,typename,using,virtual;bool Isnoshow(char ch)if(ch=n|ch=t|ch= )return true;return false;bool Isletter(char ch)if(ch=a&ch=A&ch=0&ch=9)return true;return false;bool Isunline(char ch)if(ch=_)return true;return false;bool Issplits(char ch)if(ch=|ch=|ch=|ch=|ch=(|ch=)|ch=;|ch=,|ch=.|ch=:|ch=)return true;return false;bool Iscacus(char ch)if(ch=+|ch=-|ch=*|ch=/|ch=%|ch=|ch=&|ch=|ch=!|ch=)return true;return false;void main()fstream file;char wj50;char ch;cout輸入一個(gè)要分析的程序（包括路徑和后綴）wj;file.open(wj);ch=file.get();while(ch!=EOF)if(Isunline(ch)|Isletter(ch)char k31;int i=0;ki+=ch;ch=file.get();while(Isunline(ch)|Isletter(ch)|Isdigital(ch)ki+=ch;ch=file.get();ki=0;for(int j=0;j=N;)if(k=keyj) coutk是關(guān)鍵字endl;break;else if(j=N) coutk是普通標(biāo)識(shí)符endl;j+;else if(Isdigital(ch)char m10;int i=0;mi+=ch;ch=file.get();while(Isdigital(ch)|ch=.)mi+=ch;ch=file.get();mi=0;coutm是常數(shù)endl;ch=file.get();else if(Issplits(ch)coutch是分界符endl;ch=file.get();else if(Isc