#include <iostream>

using namespace std;

class Docement
{
public:
  int docid;
  Docement ( void ) : docid ( 0 )
  {
  }
  explicit Docement ( int );
};
Docement::Docement ( int var )
{
  docid = var;
}

class Book : public Docement
{
public:
  int bookid;
  Book ( void ) : Document ( 1 ), bookid ( 1 )  //遵循1
  {
  }
};

int main ( void )
{
  Book mybook;

  return ( 0 );
}