填空题

下列程序的执行结果为 【13】 。
#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)

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