A duck call is a device that hunters use to mimic the calls (quacks) of ducks. How would you implement your own duck call that does not inherit from the Duck class

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4. what is the reason for including the following code snippet in the header file animal.h? #ifndef animal_h #define animal_h class animal { public: animal(); animal(double new_area_hunt); void birth(); void hunt(double new_area_hunt); void death(); double get_area_hunt() const; private: double area_hunt; }; #endif