c++ static 类

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01 _static.cpp

#include<iostream>using namespace std;struct student{    int id;    string name;static  string school;    student()=default;    student(int i,string n/*,string s*/){    id=i;name=n;/*school=s;*/}    ~student(){}};string student::school="ZM";int main(){    student s1(1001,"zhangsan");    student s2(1002,"lisi");    s1.school = "SZZM";    cout<<s1.school<<endl;    cout<<s2.school<<endl;}

02_static_class_member.cpp

#include<iostream>using namespace std;struct student{    int id;    string name;static  string school;    student()=default;    student(int i,string n/*,string s*/){    id=i;name=n;/*school=s;*/}    ~student(){}};string student::school="ZM";int main(){    cout<<student::school<<endl;}

03_static_class_function.cpp

#include<iostream>using namespace std;struct student{    int id;    string name;static  string school;    student()=default;    student(int i,string n/*,string s*/){    id=i;name=n;/*school=s;*/}    ~student(){}    static void set_school(string s)    {        school = s;    }};string student::school="ZM";int main(){    student s1(1001,"zhangsan");    student s2(1002,"lisi");    student::set_school("SZZM");    cout<<s1.school<<endl;    cout<<s2.school<<endl;}

04_static_list.cpp

#include<iostream>using namespace std;struct student{    int id;string name;int age;    student()=default;    student(int i,string n,int a)    :id(i),name(n),age(a)    {        student *p =new student(*this);        if(p == nullptr){            perror("new p");            return;        }        p->next = head;        head = p;    }    student(student &s){        id=s.id;name=s.name;age=s.age;    }    ~student(){        student* p=head,*q=head;        while(p)        {            if(p->id == this->id)                break;            q =p;            p=p->next;        }        if(p){            if(p == head){                head = head->next;            }else                q->next = p->next;            delete p;            return;        }else            return ;        }    student * next=nullptr;    static student * head;    static int show_stu_list()    {    student *p = head;    while(p)    {        cout<<p->id<<" "<<p->name<<" "<<p->age<<endl;        p = p->next;    }    return 0;}};student* student::head=nullptr;struct stu_list{    private:    student * head=nullptr;    public:    int create_stu_list()    {        student* p=nullptr;        char ch;        while(1)        {            p = new student();            cin>>p->id>>p->name>>p->age;            if(cin.fail())break;            p->next = head;            head = p;//          cout<<"是否继续？[Y/n]";//          cin>>ch;//          if(ch == 'n' || ch== 'N')//              break;        }        return 0;    }    int show_stu_list()    {    student *p = head;    while(p)    {        cout<<p->id<<" "<<p->name<<" "<<p->age<<endl;        p = p->next;    }    return 0;}//return value: 0/OK,-1/failed;int insert(student &s){    student *p =new student(s);    if(p == nullptr){        perror("new p");        return -1;    }    p->next = head;    head = p;    return 0;}int remove(int id){    student* p=head,*q=head;    while(p)    {        if(p->id == id)            break;        q =p;        p=p->next;    }    if(p){        if(p == head){            head = head->next;        }else            q->next = p->next;        delete p;        return 0;    }else        return -1;  }int reserve_stu_list(){    student * new_head=nullptr,*p;    if(head == nullptr)return -1;    while(head)    {        p = head;        head=head->next;        p->next = new_head;        new_head = p;    }    head = new_head;    return 0;}int release_stu_list(){    student *p=head,*q=head;    while(p)    {        q = p->next;        delete p;        p = q;    }    head= nullptr;}};student get_stu(){    student s(1004,"zhaoqi",20);    student::show_stu_list();    return s;}int main(){    student s1(1001,"zhangsan",20);    student s2(1002,"lisi",20);    student s3(1003,"wangwu",20);    get_stu();    student::show_stu_list();}

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