9. Write a C++ program to create multilevel inheritance. (Hint: Classes A1, A2, A3)

#include <iostream>

#include<conio.h>

using namespace std;

class base //single base class

{

public:

int x;

void getdata() {

 cout << "Enter value of x= "; cin >> x;

}

};

class derive1 : public base // derived class from base class

{

public:

int y;

void readdata()

{

 cout << "\nEnter value of y= "; cin >> y;

}

};

class derive2 : public derive1 // derived from class derive1

{

private:

int z;

public:

void indata() {

 cout << "\nEnter value of z= "; cin >> z;

}

void product() {

 cout << "\nProduct= " << x * y * z <<endl;

}

};

int main() {

 derive2 a; //object of derived class

 a.getdata();

 a.readdata();

 a.indata();

 a.product();

 return 0;

}

Output: