what is the interpretation of this statement " Life is not a grand harmony, conflict exist. we much learn how to live it, use it constructively and minimize it's destructive aspect"

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