#include <iostream>using namespace std;class Student{public:Student(int n,int a,float s):num(n),age(a),score(s){};void total();static float average();private:int num;int age;float score;static float sum;static int count;};void Student::total(){sum+=score;count++;}float Student::average(){return(sum/count);}float Student::sum;int Student::count;int main(){Student stud[3]={Student(1001,18,70),Student(1002,19,78),Student(1005,20,98)};int n;cout<<"please input the number of students";cin>>n;for(int i=0;i<n;i++)stud[i].total();cout<<"the average score of"<<n<<"student is"<<Student::average()<<endl;return 0;}