VIRTUAL BASE CLASSES

SOURCE CODE:
#include<iostream.h>
#include<conio.h>
class student
{
  protected:
       int rollno;
  public:
    void get_roll();
    void put_roll();
};
void student::get_roll()
{
  cout<<"\n Enter the Rollno:\t";
  cin>>rollno;
}
void student::put_roll()
{
  cout<<"\n The Rollno is:\t"<<rollno;
}
class subject:virtual public student
{
  protected:
  int sub1,sub2;
  public:
    void get_sub();
    void put_sub();
};
void subject::get_sub()
{
  cout<<"\n Enter the subject marks:\t";
  cin>>sub1>>sub2;
}
void subject::put_sub()
{
  cout<<"\n\n Marks scored in Subjects:\t";
  cout<<sub1<<"\t"<<sub2<<"\n";
}
class sports:public virtual student
{
  protected:
  int spo;
  public:
    void get_spo();
    void put_spo();
};
void sports::get_spo()
{
  cout<<"\n Enter the sports marks:\t";
  cin>>spo;
}
void sports::put_spo()
{
  cout<<"\n Marks scored in Sports:\t"<<spo<<"\n";
}
class result:public subject,public sports
{
  int res;
  public:
    void input();
    void calculate();
    void output();
};
void result::input()
{
  get_roll();
  get_sub();
  get_spo();
}
void result::calculate()
{
  res=sub1+sub2+spo;
}
void result::output()
{
 put_roll();
 put_sub();
 put_spo();
 cout<<"\n Total Result:\t"<<res;
}
void main()
{
 result R;
 clrscr();
 R.input();
 R.calculate();
 R.output();
 getch();
}

OUTPUT:

 Enter the Rollno:      5072

 Enter the subject marks:       80      80

 Enter the sports marks:        75


 The Rollno is: 5072

 Marks scored in Subjects:      80      80

 Marks scored in Sports:        75

 Total Result:  235
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