#include<iostream>
using namespace std;
class Student
{
      public:
             Student(int n,float s):num(n),score(s){}
             void change(int n,float s) { num=n; score=s; }
             void display() {cout<<num<<" "<<score<<endl;}
             
      private:
               int num;
               float score;
      };
      
void fun(Student &st)
{
     st.display();
     st.change(101,45);
     st.display();
     
     }
int main()
{
    Student stud(101,78.5);
    fun(stud);
    system("pause");
    return 0;
    
    
    
    }