// utility.h

#ifndef __utility__has__been__included__
#define __utility__has__been__included__

#include <iostream>
#include <string>

using namespace std;

class useful
{ protected:
    string name;
    int number;

  public:
    useful(string s, int n);
    ~useful();
    string get_name() const;
    int get_number() const;
    void enlarge();
    void print(ostream & out) const; };

ostream & operator<<(ostream & out, const useful & u);

int factorial(int n);

#endif