3-8

 #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;};int main(){ Student stud(101,78.5); void fun(Student &); fun(stud); return 0;}void fun(Student &stu){ stu.display(); stu.change(101,80.5); stu.display();}