class Point
{
public:   
       void init()
       { 
       }
       static void output()
       {
       }
};
void main()
{
       Point::init();
       Point::output();
}

void main()
{
       Point pt;
       pt.init();
       pt.output();
}

#include <stdio.h>
class Point
{
public:   
       void init()
       { 
       }
       static void output()
       {
              printf("%d\n", m_x);
       }
private:
       int m_x;
};
void main()
{
       Point pt;
       pt.output();
}

class Point
{
public:   
       void init()
       { 
              output();
       }
       static void output()
       {
       }
};
void main()
{
       Point pt;
       pt.output();
}

#include <stdio.h>
class Point
{
public:   
       Point()
       { 
              m_nPointCount++;
       }
       ~Point()
       {
              m_nPointCount--;
       }
       static void output()
       {
              printf("%d\n", m_nPointCount);
       }
private:
       static int m_nPointCount;
};
void main()
{
       Point pt;
       pt.output();
}

#include <stdio.h>
#include <string.h>
const int MAX_NAME_SIZE = 30; 

class Student 
{ 
public: 
    Student(char *pszName);
    ~Student();
public:
       static void PrintfAllStudents();
private: 
    char    m_name[MAX_NAME_SIZE]; 
    Student *next;
       Student *prev;
    static Student *m_head;
}; 

Student::Student(char *pszName)
{ 
    strcpy(this->m_name, pszName);

       //建立雙向鏈表，新數(shù)據(jù)從鏈表頭部插入。
    this->next = m_head;
       this->prev = NULL;
       if (m_head != NULL)
              m_head->prev = this;
    m_head = this; 
} 

Student::~Student ()//析構(gòu)過程就是節(jié)點的脫離過程 
{ 
       if (this == m_head) //該節(jié)點就是頭節(jié)點。
       {
              m_head = this->next;
       }
       else
       {
              this->prev->next = this->next;
              this->next->prev = this->prev;
       }
} 

void Student::PrintfAllStudents()
{
       for (Student *p = m_head; p != NULL; p = p->next)
              printf("%s\n", p->m_name);
}

Student* Student::m_head = NULL; 

void main() 
{  
       Student studentA("AAA");
       Student studentB("BBB");
       Student studentC("CCC");
       Student studentD("DDD");
       Student student("MoreWindows");
       Student::PrintfAllStudents();
}