#include<iostream>
#include<string>

using namespace std;

//----------------------------------------------------------------
//----------------------------TOKENTYPE---------------------------
enum TokenType
 {
   	UNKNOWN_TOKEN,
    VARIABLE_IDENTIFIER,
    INTEGER ,
    OPERATOR,
    LEFT_PAREN ,
    RIGHT_PAREN ,
    EOT
 };

 //--------------------------------------------------------------
 //-----------------------TOKEN----------------------------------
 struct Token
 {
 enum TokenType  kind;
 string spelling;

 Token(enum TokenType _kind,string _spelling)
   {
    kind=_kind;
	spelling=_spelling;
   }

 void print()
  {
  cout<<"Token:"<<endl;
  cout<<"TokenType: "<<kind	<<"  Spelling: "<<spelling;
  }
 } ;
 //-------------------------------------------------------------
 //-------------------------------------------------------------
  class LexicalScanner
{

private:

   char CurrentChar;
   string CurrentSpelling;
   enum TokenType CurrentKind;
   istream inputStream;
public:
  
   LexicalScanner(istream _inputstream);
   void skipspaceAndcomment();
   enum TokenType  scanToken();
   Token scan();

private:

void takeit();
void take(char expectedChar);



};
  LexicalScanner::LexicalScanner(istream _inputstream)
{
  inputStream(_inputstream);
  CurrentKind(UNKNOWN_TOKEN);
  CurrentChar(EOT);
  CurrentSpelling();

}