3-7（1）

#include 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()const{cout<<num<<" "<<score<<endl;}private:int num;float score;};int main(){ //Student stud(101,78.5); const Student stud(101,78.5); stud.display(); //stud.change(101,80.5); //stud.display(); return 0;}