C++习题-对常对象进行操作[3.7.1]

#include <iostream>
using namespace std;

class Student
{
    public:
    Student(int n,float s):num(n),score(s){}
    
    void change(int n,float s) const
    {
        num = n;
        score = s;
    }
    
    void display() const
    {
        cout << num << " " << score << endl;
    }
    
    private:
    mutable int num;
    mutable float score;
};

int main()
{
    const Student stud(101,78.5);
    stud.display();
    stud.change(101,80.5);
    stud.display();
    
    system("pause");
    return 0;
}