C++习题-指向常对象的指针变量[3.7.4]

#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;
    }
    
    void fun(Student &p,int n,float s)
    {
         p.change(n,s);
         p.display();
    }
    
    private:
    mutable int num;
    mutable float score;
};

int main()
{
    Student stud(101,78.5);
    Student stud1(101,11.8);
    const Student * p = &stud; //定义指向常对象的指针变量

    p = &stud1; //可以进行更新指针的指向

    p->display();
    p->change(101,80.5);
    p->display();
    
    system("pause");
    return 0;
}


运行结果：
101 11.8
101 80.5