C++ program : Tof show working of Virtual base class

#include<iostream.h>
#include<conio.h>
class student
{
  protected:
   int rollno;
   char name[50];
  public:
   student()
   {
      cout<<"Enter the Rollno : ";
      cin>>rollno;
      cout<<"Enter the Name   : ";
      cin>>name;
   }
   void stud_show()
   {
      cout<<"\tStudent Record\n Rollno : "<<rollno<<"\n Name : "<<name;
   }
};

class test : virtual public student
{
   protected:
   float sub[5];
   public:
   test();
   void test_show();
};
test::test()
{
   cout<<"\tEnter Marks\n";
   for(int i=0;i<5;i++)
   {
      cout<<"Subject "<<i<<": ";
      cin>>sub[i];
   }
}
void test::test_show()
{
   cout<<"\nMarks";
   for(int i=0;i<5;i++)
      cout<<"\nSubject "<<i<<": "<<sub[i];

}
class sports : virtual public student
{
     protected:
   float score;
     public :
   sports()
   {
      cout<<"Enter Sports Score :";
      cin>>score;
   }
   void sports_show()
   {
      cout<<"\n Sports score :"<<score;
   }
};
class result : public test,public sports
{
   float total;
    public:
   void result_show();
};
void result::result_show()
{
   total=0;
   for(int i=0; i<5;i++)
      total+=sub[i];
   cout<<"\n   Total : "<<total+score;
}

int main()
{
   clrscr();
   result sud;
   sud.stud_show();
   sud.test_show();
   sud.sports_show();
   sud.result_show();
   getch();
   return 0;
}

Class diagram 

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