Hybrid Inheritance

"Hybrid Inheritance" is a method where one or more types 
of inheritance are combined together and used.

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

class mm
  {
    protected:
      int rollno;
    public:
      void get_num(int a)
       { rollno = a; }
      void put_num()
       { cout << "Roll Number Is:"<< rollno << "\n"; }
  };
class marks : public mm
  {
   protected:
     int sub1;
     int sub2;
   public:
     void get_marks(int x,int y)
       {
         sub1 = x;
         sub2 = y;
       }
     void put_marks(void)
       {
          cout << "Subject 1:" << sub1 << "\n";
          cout << "Subject 2:" << sub2 << "\n";
      }
  };

class extra 
  {
    protected:
      float e;
    public:
    void get_extra(float s)
      {e=s;}
    void put_extra(void)
      { cout << "Extra Score::" << e << "\n";}
  };

class res : public marks, public extra{
   protected: 
     float tot;
   public:
     void disp(void)
       {
         tot = sub1+sub2+e; 
         put_num();
         put_marks();
         put_extra();
         cout << "Total:"<< tot;
       }
 };

int main()
 {
   res std1;
   std1.get_num(10);
   std1.get_marks(10,20);
   std1.get_extra(33.12);
   std1.disp();
   return 0;
 }