#include <iostream>
using namespace std;

class Student{
public:
    void setname(char *name);
    void setage(int age);
    void setscore(float score);
    void show();
private:
    char *name;
    int age;
    float score;
};

void Student::setname(char *name){
    this->name = name;
}
void Student::setage(int age){
    this->age = age;
}
void Student::setscore(float score){
    this->score = score;
}
void Student::show(){
    cout<<this->name<<"的年龄是"<<this->age<<"，成绩是"<<this->score<<endl;
}

int main(){
    Student *pstu = new Student;
    pstu -> setname("李华");
    pstu -> setage(16);
    pstu -> setscore(96.5);
    pstu -> show();

    return 0;
}

#include <iostream>

using namespace std;

class Student {
public:
    Student(char *name, int age, float score);
    void show();
public:
    static int m_total; // 静态成员变量
private:
    char *m_name;
    int m_age;
    float m_score;
};

int Student::m_total = 0; // 初始化静态成员变量时不需要加static


Student::Student(char *name, int age, float score) {

}
void Student::show() {

}


int main()
{
    Student::m_total  = 10; // 可以直接由类名访问
    // 栈区
    Student stu("Jack",15,92.5f);
    stu.m_total = 20;      // 也可以直接由对象名访问
    // 堆区
    Student *pstu = new Student("Tom",16,96);
    pstu->m_total = 20;    // 也可以直接由对象名访问

    delete pstu;
    return 0;

}

int Student::m_total = 0; // 初始化静态成员变量时不需要加static

#include <iostream>
using namespace std;

class Student{
public:
    Student(char *name, int age, float score);
    void show();
public:  //声明静态成员函数
    static int getTotal();
    static float getPoints();
private:
    static int m_total;  //总人数
    static float m_points;  //总成绩
private:
    char *m_name;
    int m_age;
    float m_score;
};

int Student::m_total = 0;
float Student::m_points = 0.0;

Student::Student(char *name, int age, float score): m_name(name), m_age(age), m_score(score){
    m_total++;
    m_points += score;
}
void Student::show(){
    cout<<m_name<<"的年龄是"<<m_age<<"，成绩是"<<m_score<<endl;
}
//定义静态成员函数
int Student::getTotal(){
    return m_total;
}
float Student::getPoints(){
    return m_points;
}

int main(){
    (new Student("小明", 15, 90.6)) -> show();
    (new Student("李磊", 16, 80.5)) -> show();
    (new Student("张华", 16, 99.0)) -> show();
    (new Student("王康", 14, 60.8)) -> show();

    int total = Student::getTotal();
    float points = Student::getPoints();
    cout<<"当前共有"<<total<<"名学生，总成绩是"<<points<<"，平均分是"<<points/total<<endl;

    return 0;
}