#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(101,80.4);
    stud.display();
    system("pause");
    return 0;
    
    
    
    }