Protected Access

#include<iostream>
using namespace std;

class BaseDevice
{
protected:
      int variableid;
};

class DerivedDevice: public BaseDevice
{
      public:
            void setID(int v)
            {
                  this->variableid = v;
            }

            void printID()
            {
                  cout<<"Device ID: " << variableid;
            }
};
int main()
{
DerivedDevice d;
d.setID(101);
d.printID();
}