Write the interface (.h file) of a class Accumulator containing: 0 A data member named sum of type integer. o A constructor accepting no parameters. 0 A function named getSum that accepts no parameters and returns an integer. o A function named add that accepts an integer parameter and returns no value. 1 - class Accumulator { private: int sum; public: DO VOULAWNH Accumlator (); int getSum () ; void add(int x) ; 8 3