#include <stdio.h>
#include <conio.h>
#include <iostream.h>


class user
{
  protected :
                int code;
                char name[20];
  public :
           user()
           {
             code=0;
             strcpy(name,"");
           }
           user(int code0, char *name0)
           {
              code = code0;
              strcpy(name,name0);
           }
           int getcode()
           {
             return code;
           }
           char * getname()
           {
              return name;
           }
           void setcode(int code0)
           {
              code = code0;
           }
           void setname(char name0[20])
           {
               strcpy(name,name0);
           }
           void display_data()
           {
              cout << " Code = " << code << endl;
              cout << " Onoma = " << name << endl;

           }

           void readdata()
           {

              cout << "Give code :";
              cin >> code;
              cout << "Give name :";
              cin >> name;
           }
};

class usage : public user
{
   private :
             char usage_date[10];
             int computer_code;
             float duration;
             float charge;
   public :
            usage():user()
            {
             strcpy(usage_date,"");
             computer_code =0;
             duration =0 ;
             charge =0;

            }
            usage(int code0, char *name0, char *udate0, int c_c, float duration0, float charge0): user(code0, name0)
            {

             strcpy(usage_date,udate0);
             computer_code =c_c;
             duration =duration0 ;
             charge = charge0;
            }
            char * get_usage_date()
            {
              return usage_date;
            }
            int get_computer_code()
            {
               return computer_code;
            }
            float get_duration()
            {
              return duration;
            }
            float get_charge()
            {
               return charge;
            }
            void set_usage_date(char *ud0)
            {
               strcpy(usage_date,ud0);

            }
            void set_computer_code(int cc0)
            {
              computer_code = cc0;
            }
            void set_duration(float dur0)
            {
               duration = dur0;
            }
            void set_charge(float charge0)
            {
               charge =charge0;
            }
            void display_data()
            {
              user :: display_data();
              cout << "Usage date = " << usage_date << endl;
              cout << "Computer code  = " << computer_code << endl;
              cout << "Duration = " << duration << endl;
              cout << "Charge  = " << charge << endl;
            }
            void read_data()
            {
              user::readdata();
              cout << "Give Usage Date :";
              cin >> usage_date;
              cout << "Give computer code :";
              cin >> computer_code;
              cout << "Give duration :";
              cin >> duration;
              //cout << "Give charge :";
              //cin >> charge;

            }
            void calculate_charge()
            {
              charge = (duration/60)*1.2;
            }

};

main()
{  usage *a[500],a0;
   usage a1(1,"Theo Lantzos","15/1/2010",16,1.30,3);
   a1.display_data();
   cout << "==============" << endl;
   a0.display_data();
   a0.read_data();
   a0.calculate_charge();
   a0.display_data();  
   cout << sizeof(a);
   cout << endl << 500 * sizeof(a1);
   getch();
}