单选题 有如下程序：
#include＜iostream＞
using namespace std;
class Point{
public:
Point(int xx, int yy):x(xx), y(yy){}
int Getxy(){return x+y; }
private:
int x, y;
};
class Circle:public Point{
public:
Circle(int r, int x=0, int y=0):Point(x, y), radius(r){}
private:
int radius;
};
int main(){
Circle a(6, 5, 4), b(4, 3, 2);
cout＜＜a.Getxy()+b.Getxy();
return 0;
}
此程序运行后的输出结果为______。