protected.cpp

// c++ oop protected access modifier

#include <iostream>

using namespace std;

// defining a class
class Parent {
    protected:                     // we defined that this class data members will be protected
        int number_protected;
};

// defining a sub class or derived class
class Child : public Parent {
    public:                     // and we kept the member function public
        void setNumber(int number) {
            number_protected = number;  // Child class can access the inherited protected data members of Parent Class
        }
        
        void displayID() {
            cout << "Protected Number is: " << number_protected << endl;
        }
};

//main function
int main(){
    Child obj1;                // create a child object
    
    obj1.setNumber(2);          // member function of derived class can access the protected data members of base class
    obj1.displayID();

    return 0;
}