单选题 有如下程序：
#include ＜iostream ＞
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 ＜＜ Point :: number ＜＜ endl;
delete[ ] ptr;
return 0;