scanner.h

#include
     
      #include
      
       #include
       
        using namespace std;class Scanner{	private:		string infile; 		string outfile; 		string key[33];		string helpkey[33];	public:		Scanner(string infile_temp,string outfile_temp);		void readFile();		void getToken(string s,ofstream &out);		bool isLetter(char ch);		bool isDigit(char ch);		int reserve(const string& s);};
       
      
     

　　scanner.cpp

#include "scanner.h"using namespace std;Scanner::        Scanner(string infile_temp,string outfile_temp){    infile = infile_temp;    outfile = outfile_temp;    string key_temp[33] = {
   "","auto","double","int","struct","break","else","long","switch",            "case", "enum","register","typedef","char","extern","return","union","const",            "float","short","unsigned","continue","for","signed","void","default","goto",            "sizeof","volatile","do","if","while","static"};    for(int i=0;i<33;i++){        key[i] = key_temp[i];    }                    }void Scanner::readFile(){        ifstream in(infile);    ofstream out(outfile);    string s;    while(getline(in,s)){        getToken(s,out);    }}//判断是否letterbool Scanner::isLetter(char ch){    if((ch>=65&&ch<=90)||(ch>=97&&ch<=122)||ch==35||ch==46)    return true;    else     return false;}//判断是否数字bool Scanner::isDigit(char ch){    if(ch>=48&&ch<=57)    return true;    else     return false;}//查找关键字int Scanner::reserve(const string& s){    for(int i=1;i<33;i++)    if(s==key[i])       return i;    return 0;}void Scanner::getToken(string s,ofstream &out){            size_t i=0,code;            char ch;            string temp="";            ch=s[i];            while(i
     
      '){            i++;            ch=s[i];            if(ch=='=')               out<<">="<<'\t'<<"大于"<
      
       "<<'\t'<<"小于"<