# Count students and scores (static)

Source: Internet
Author: User

Question:

Count students and scores

Problem description

Define a student class to record the student's student ID and C ++ course score. Static member variables and static member functions are required to calculate the total score and average score of the class C ++ course.

Input

Enter the student ID and score, and each student's information occupies a row until the end of the file.

The output consists of two rows. The first row contains the total number of students and the total score, which are separated by spaces;
The average score of the second row.
Sample Input
`101  30102  50103  90104  60105  70`
Sample output
`5 30060`

Reference code:

`#include <iostream>#include <stdio.h>#include <string.h>using namespace std;class Student{private:    int id, score;    static int count;    static int sum;public:    Student(int i, int s);    Student(const Student&);    ~Student();    static void show();};Student::Student(int i, int s){    id = i;    score = s;    count++;    sum += score;}Student::Student(const Student& c){    id = c.id;    score = c.score;}Student::~Student(){}void Student::show(){    cout << count << " " << sum << endl;    cout << (double)(1.0 * sum / count) << endl;}int Student::count = 0;int Student::sum = 0;int main(){    //freopen("1.txt", "r", stdin);    int id, score;    while (cin >> id >> score)        Student x(id, score);    Student::show();    return 0;}`
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