#include <iostream>
#include <cstring>

using namespace std;

class NameString{
private:
char *str;
public:
    NameString(char *s="...")
    {
        str = new char[strlen(s)+1]; 
        strcpy(str,s);
//        cout<<"构造 NameString OK!"<<endl;
    }

void print()
    {
        cout<<str;
    }

~NameString()
    {
//        cout<<"析构 NameString OK!"<<endl;
        delete str;
    }
};

class Student{
private:
int StudentNO;
    NameString Name;
int Scores;
static int total_Scores;
static int total_Num;
public:
    Student(int a,char *b,int c):StudentNO(a),Name(b),Scores(c)
    {
        total_Scores += c;
        total_Num++;
//        cout<<"构造 Student OK!"<<endl;
    }

void print()
    {
        cout<<StudentNO<<'\t';
        Name.print();
        cout<<'\t'<<Scores<<endl;
    }

void average()
    {
        cout<<"Average:"<<total_Scores/total_Num<<endl;
    }

static void total_disp()
    {
        cout<<"Total_Scores:"<<total_Scores<<endl;
        cout<<"Total_Num:"<<total_Num<<endl;
    }

};

int Student::total_Scores = 0;
int Student::total_Num = 0;

int main()
{
    Student st1(1,"wen",94);
    Student st2(2,"hao",100);
    Student st3(3,"lin",100);

    cout<<"学号"<<'\t'<<"姓名"<<'\t'<<"成绩"<<endl;
    st1.print();
    st2.print();
    st3.print();

    Student::total_disp();

    st1.average();

return 0;

}