#include<iostream>
using namespace std;
class student{
private:string name;
	  int numble;
	  int score;
	  static int total;
	  static float ave;
	  static float sum;
public:student(string n,int num,int s);
	  void output();
};
student::student(string n,int num,int s)
{
	name = n; numble = num; score = s;
	total++;
	sum += score;
	ave = sum / total;
}
void student::output()
{
	cout << "第" << total << "个学生：" << name << "  " << numble <<"  " << score << endl;
	cout << "总人数：" << total << endl;
	cout << "平均分：" << ave << endl;
}
int student::total = 0;
float student::ave = 0;
float student::sum = 0;
int main()
{
	student s1("张三", 1, 89);
	s1.output();
	student s2("李四", 2, 95);
	s2.output();
	student s3("王五", 3, 90);
	s3.output();
	return 0;
}