已知有如下类Point的声明：class Point{int x,y;public: Point(int px=0,int py=0); Point(Point &p);};Point::Point(int px,int py):x(px),y(py){ cout<<'('<<px<<","<<py<<')'; }Point::Point(Point &p){ x=p.x; y=p.y; cout<<"Copy:"<<'('<<p.x<<","<<p.y<<')';}若执行以下语句，将会输出 。 Point p1(10,5),p2(p1),*pt; pt=new Point; delete pt;