b63.cpp

#include <iostream>
using namespace std;

class Base
{

    int data1;

public:
    int data2;
    void setData();
    int getdata1();
    int getdata2();
};

void Base ::setData()
{
    data1 = 10;
    data2 = 20;
}
int Base ::getdata1()
{
    return data1;
}

int Base ::getdata2()
{
    return data2;
}

class Derived : public Base
{
    int data3;

public:
    void process();
    void display();
};

void Derived ::process()
{
    data3 = data2 * getdata1();
}

void Derived ::display()
{
    cout << "the value of data1 is " << getdata1();
    cout << "the value of data2 is " << data2;
    ;
    cout << "the value of data3 is " << data3;
    ;
}

int main()
{
    Base b1;
    b1.setData();

    Derived der;
    der.process();
    der.display();

    return 0;
}