C++ Program to Illustrate Access Control in Inheritance

#include <iostream>        
using namespace std;
 
class Base {
    public:
        int i;
        void printValues() {
        cout << "Base::i = " << i << "\n"
             << "Base::c = " << c << "\n"
             << "Base::d = " << d << "\n";
    }
    private:
        char c;
    protected:
        double d;
    Base() : i(0), c('a'), d(0) {}
 
};
 
class Derived : public Base {
    public:
        void changeI() {
        i = 10;
        cout << "Changing Base::i to 10\n";
    }
    void changeC() {
        // c = 'j';
        cout << "Unable to access Base::c\n";
    }
    void changeD() {
        d = 10;
        cout << "Changing Base::d to 10\n";
    }    
};
 
int main () {
    Derived d;
 
    d.printValues();
    d.changeI();
    d.changeC();
    d.changeD();
    d.printValues();
}

Output:

Base::i = 0
Base::c = a
Base::d = 0
Changing Base::i to 10
Unable to access Base::c
Changing Base::d to 10
Base::i = 10
Base::c = a
Base::d = 10