PRA_25

/* A program to demonstrate multilevel inheritance */
#include<iostream>
using namespace std;
class Circle
{
	public:
		float r;
		Circle()
		{
			cout << "Enter Radius :";
			cin >> r;
		}
};
class Cylinder: public Circle
{
	public:
	float h;
		Cylinder()
		{
			cout << "Enter Height :";
			cin >> h;			
		}
};
class Cone:public Cylinder
{
	public:
	float l;	
		Cone()
		{
			cout << "Enter Slant Height :";
			cin >> l;
		}
};
class Area: public Cone
{	
	double cir_a;
	double cyl_a;
	double con_a;
	public:
	Area()
	{
		cir_a=3.14*r*r;
		cyl_a=2*(cir_a+(3.14*r*h));
		con_a=cir_a+(3.14*r*l);
		cout <<endl;	
		cout <<"Area of Circle : "<< cir_a<<endl;
		cout <<"Area of Cylinder : "<< cyl_a<<endl;
		cout <<"Area of Cone : "<< con_a<<endl;
	}
};
int main()
{
	Area obj1;	
	return 0;
}
/*
Output:
Enter Radius :5
Enter Height :7
Enter Slant Height :8

Area of Circle : 78.5
Area of Cylinder : 376.8
Area of Cone : 204.1

--------------------------------
Process exited after 11.05 seconds with return value 0
Press any key to continue . . .
*/