请问这个程序为什么错了呀，是不是系统环境的问题啊😂需要怎么操作让代码正常运行🙏

#include
using namespace std;
class Point{
public:
Point(int x=0,int y=0):x(x),y(y) {
count++; }

Point(Point &p)
{
x=p.x;
y=p.y;
count++;
}
~Point(){count--;}
int getX(){return x;}
int getY(){return y;}
void showCount(){
cout<<"Object count="<<count<<endl;
}
private:
int x,y;
static int count;
constexpr static int origin=0;
};
int Point::count=0;
consterxpr int Point::origin;
int main()
{
Point a(4,5);
cout<<"Point A:"<<a.getX()<<","<<a.getY();
a.showCount();
Point b(a);
cout<<"Point B:"<<b.getX()<<","<<b.getY();
b.showCount();
return 0;
}

consterxpr是C++11标准的内容，你在编译的时候，要在编译参数里面加上-std=c++11