关于C++静态数据成员的实现讲解

#include <iostream>
#include <cstring>
using namespace std ; 
class Student 
{
 private :
 //静态成员变量 
 static int age ;
 static float score ; 
 string name ;
 public :
 static int x , y ;
 //构造函数 
 Student();
 //析构函数 
 ~Student(); 
 //设置信息 
 int setstuinfo(int age , float score , string name);
 //打印信息 
 int Printstuinfo();
};
//静态成员必须初始化 
int Student::age = 24 ; 
float Student::score = 86.6 ; 
int Student::x = 100 ; 
int Student::y = 200 ;
Student::Student()
{
 this->name = "YYX" ;
 cout << this->name << endl ;
 cout << this->age << endl ; 
 cout << this->score << endl ; 
}
Student::~Student()
{
 this->name = "NULL";
 cout << this->name << endl ;
}
int Student::setstuinfo(int age , float score , string name)
{
 this->age = age ; 
 this->score = score ; 
 this->name = name ;
}
int Student::Printstuinfo()
{
 cout << this->name << endl ;
 cout << this->age << endl ; 
 cout << this->score << endl ; 
}
int main(void)
{
 Student stu1 ;
 //指针 
 Student *p ;
 p = &stu1 ;
 p->setstuinfo(25,96,"XXX");
 p->Printstuinfo();
 //静态成员的引用---->不可以引用私有成员
 cout << p->x << endl ; 
 cout << p->y << endl ;
 Student::x = 80 ;
 Student::y = 90 ;
 cout << p->x << endl ; 
 cout << p->y << endl ;
 return 0 ;
}