//6. Here’s a class declaration:
class Move {
private:
    double x;
    double y;
public:
    Move(double a = 0, double b = 0); // sets x, y to a, b
    showmove() const; // shows current x, y values
    Move add(const Move & m) const;
        // this function adds x of m to x of invoking object to get new x,
        // adds y of m to y of invoking object to get new y, creates a new
        // move object initialized to new x, y values and returns it
    reset(double a = 0, double b = 0); // resets x,y to a, b
};
//Create member function definitions and a program that exercises the class.