#include <iostream>

class Student {
private:
    int ID, grade;

public:
    Student() {
        this->ID = 0;
        this->grade = 0;
    };

    Student(int newID, int newGrade) : ID(newID), grade(newGrade){};

    void display();

    void set(int, int);
};

void Student::display() {
    std::cout << "ID: " << this->ID << ", Grade: " << this->grade << std::endl;
}

void Student::set(int newID, int newGrade) {
    this->ID = newID;
    this->grade = newGrade;
}

int main() {
    Student stu[5];
    stu[0].set(21394,89);
    stu[1].set(2394888, 100);
    stu[2].set(299, 70);
    stu[3].set(3999, 10);
    stu[4].set(4999, 60);
    stu[0].display();
    stu[2].display();
    stu[4].display();
    return 0;
}