Which of the following is a valid format symbol in microsoft excel? dollar sign, comma, percent sign or all of them? i can't figure it our for the life of

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