自定义如下形式的一个称为point的类，其对象表示平面上的一个点（x，y），并通过类成员方式对该类重载二目运算符“+”和“^”，用来求出两个对象的和以及两个对象（平面点）的距离。-The form of a custom class called point object represents a point in the plane (x, y), and the class by class members overloaded binary operator " +"　and " ^" , used to and obtained two objects and the distance of the two objects (flat point).