#include 
  
   
#include 
   
     using namespace std; namespace Animals { class Dog { private: string name; public: Dog(string name) : name(name) { } Dog() : name(NULL) { } virtual void bark() { cout << "Baseclass: Hi, " << name << endl; } string getName() { return name; } void setV(string aname) { name = aname; } }; class SDog : public Dog { public: SDog(string name) : Dog(name){} virtual void bark() { Dog::bark(); cout << "Dericed Class: Hi, " << Dog::getName() << endl; } }; } int main() { using namespace Animals; Dog a("martin"); SDog b("merry"); a.bark(); b.bark(); return 0; }