有如下程序：
#include
using namespace std;
class Point {
public:
static int number;
public:
Point() { number++; }
~Point() { number--; }
};
int Point::number=0;
int main() {
Point *ptr;
Point A, B;
{
Point* ptr_point=new Point［3］;
ptr=ptr_point;
}
Point C;
cout<