C++类使用static小例子（新手学习C++）

//为什么类的成员中不能包括动态分配的数据,若包含静态数据怎么使用？
#include <iostream>
using namespace std;
class point
{
    private:
        static  int xres;
        int yres;
    public:
       
        point(int = 0,int = 0);
        void set_point(int, int) ;
        void get_point();
};
point::point(int x, int y)
{
   // xres = x;
    yres = y;
}
void point:: set_point(int x, int y)
{
   // xres = x;
    yres = y;
}
 void point::get_point()
{
    cout << "x = " << xres << endl;
    cout << "y = " << yres << endl;
}

int point:: xres = 11; //此处楼主已验证，只有静态的public型变量才可以如此赋值

int main()
{
    point p(10, 10);
    point p1(30, 20);

cout << &p << endl;
    cout << &p1 << endl;

p.get_point();
    p1.get_point();

cout << point::xres;

return 0;
}