single.cpp

#include<iostream>
using namespace std;

class Base
{
    public:
        int A,B;

        Base()
        {
            cout<<"Inside Base constructor\n";
        }
        ~Base()
        {
            cout<<"Inside Base destructor\n";
        }
        void fun()
        {
            cout<<"Inside Base Fun\n";
        }

};

class Derived : public Base
{
    public:
        int X,Y;

        Derived()
        {
            cout<<"Inside derived constructor\n";
        }
        ~Derived()
        {
            cout<<"Inside derived destructor\n";
        }
        void gun()
        {
            cout<<"Inside gun of derived\n";
        }
};
//doxygen comment
int main()
{
    Derived * ptr = NULL;

    ptr = new Derived;

    ptr->fun();
    ptr->gun();
    
    delete ptr;
    return 0;
}