Protected Access

#include <iostream>
using namespace std;

class BaseDevice {
protected:
      int id;
};

class DerivedDevice : public BaseDevice {
public:
      void setId(int v){id=v;}
      void printId(){cout<<"Device ID: "<<id;}
};

int main() {
   DerivedDevice d;
   d.setId(101);
   d.printId();
   return 0;
}