#include<iostream>
#include<string>
using namespace std;
class student
{
public:
    student(float number1, string name1, float score1)
    {
        number = number1;
        name = name1;
        score = score1;
    }
    void print()
    {
        cout << "number:" << number << endl;
        cout << "name:" << name << endl;
        cout << "score:" << score << endl;
    }
protected :
    float number;
    string name;
    float score;
};
class USstudent :public student
{
    USstudent(float number1, string name1, float score1, string major1) 
        :student(number1, name1, score1)
    {
        major = major1;
    }
    void print()
    {
        student::print();
        cout << "major:" << major << endl;
    }
private :
    string major;
};
int main()
{
    USstudent stu(22116, "chih", 89,"computer science" );
    stu.print();
    return 0;
}