C++ Program to Demonstrate Multi Level Inheritance

C++ Program to Demonstrate Multi Level Inheritance:

#include<iostream.h>
#include<conio.h>
class student
{
protected:
int roll_number;
public:
void get_number(int);
void put_number(void);
};
void student::get_number(int a)
{
roll_number=a;
}
void student::put_number()
{
cout<<"Roll Number: "<<roll_number<<"\n";
}
class test:public student
{
protected:
float sub1;
float sub2;
public:
void get_marks(float,float);
void put_marks(void);
};
void test::get_marks(float x,float y)
{
sub1=x;
sub2=y;
}
void test::put_marks()
{
cout<<"Marks in SUB1= "<<sub1<<"\n";
cout<<"Marks in SUB2= " <<sub2<<"\n";
}

class result:public test
{
float total;
public:
void display(void);
};
void result::display(void)
{
total=sub1+sub2;
put_number();
put_marks();
cout<<"Total= "<<total<<"\n";
}
int main()
{
clrscr();
result student1;
student1.get_number(111);
student1.get_marks(75.0,59.5);
student1.display();
getch();
return(0);
}