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;
void main()
Point *ptr;
Point A,B;

Point* ptr_point=new Point[3];
ptr=ptr_point;

Point C;
cout＜＜Point::number＜＜endl;
delete []ptr;

运行时输出的结果是