C++ program to implement multilevel inheritance.

Inheritance is the striking feature of object oriented programming. Below is a program which involves multilevel inheritance. In multi level inheritance derived class becomes base class for further inheritance. In below program PERSON is initially base class and STUDENT is the derived class. In next inheritance STUDENT which is a derived class initially, now it becomes base class and EXAM is its derived class.
To handle the data of birth field we use structure named as struct dob.
Please include and header files before declaration of PERSON class.
//PROGRAM TO GET STUDENT INFO USING MULTILEVEL INHERITANCE.
#include
#include
class PERSON
{
protected:
char name[20],add[20];
struct dob
{
int dd,mm,yyyy;
}d;
public:
void input(void)
{
cout<<"Enter name, date of birth and address of student\n";
cin>>name>>d.dd>>d.mm>>d.yyyy>>add;
}
void display(void)
{
cout<<"\n Student name is "< cout<<"\n Student address is "< cout<<"\n Date of birth of student is "< }
};
class STUDENT:public PERSON
{
protected:
int rno,sem_no;
public:
void get(void)
{
cout<<"\nEnter roll number and semester number\n";
cin>>rno>>sem_no;
}
void put(void)
{
cout<<"\n Student roll number is "< cout<<"\n Student semester is "< }
};
class EXAM:public STUDENT
{
protected:
int mark1, mark2,total;
float avg;
public:
void indata(void)
{
cout<<"\nEnter marks in two tests(Enter marks out of 25)\n";
cin>>mark1>>mark2;
}
void disp(void)
{
total=mark1+mark2;
avg=float(total)/2;
cout<<"\n Student marks in first test are "< cout<<"\n Student marks in second test are "< cout<<"\n Student average marks in two test are "< }
};
void main(void)
{
class EXAM e;
clrscr();
e.input();
e.get();
e.indata();
clrscr();
cout<<"\n Student details are as follows\n";
e.display();
e.put();
e.disp();
getch();
}