关于静态成员函数的一个问题，请大佬帮我看看。

#include<iostream>
#include<string.h>
using namespace std;
class student
{
private:
    static int total;
    int num;
    char name[20];
public:

    student(){total++;}
    ~student(){total--;}
    student(int n,const char *p="wang");
    void getname();
    int getnum();
    static void Print();
};
int student::total=0;
student::student(int n,const char *p)
{
    num=n;
    strcpy(name,p);
    total++;
}
void student::getname()
{
    cout<<name<<endl;
}
int student::getnum()
{
    return num;
}
void student::Print()
{
    cout<<"The number of all students:"<<total<<endl;
}
int main()
{
    student::Print();
    student *P=new student(13);
    student::Print();
    P->Print();
    delete P;
    P->Print();         //？？？？？？？？          
    student s[2];
    student::Print();
    s[1].Print();
      return 0;
}
问：为什么对象指针P被释放后，还能正确调用静态成员函数？