下列程序的执行结果为【 】。 include ＜iostream. h＞ class Point { public: Point(double i, double j) { x=i; y=j;} double Area() const { return 0.0;} private: double x, y; }; class Rectangle: public Point { public: Rectangle(double i, double j, double k, double 1) double Area() const {return w * h;} private: double w, h; }; Rectangle: :Rectangle(double i, double j, double k. double 1): Point(i,j). { w=k, h=1 } void fun(Point &s) { cout＜＜s. Area()＜＜end1; } void main( ) { Rectangle rec(3.0, 5.2, 15.0. 25.0); fun(rec) }