第四题

#include <iostream>
using namespace std;
class Student
 {public:
   void sl();
   void display();
  private:
   int num;
   float score;
 };
void Student::display()
 {cout<<num<<" "<<score<<endl;}
void Student::sl()
{
cout<<"学号：";
cin>>num;
cout<<"成绩：";
cin>>score;
}
int main()
{
Student stud[5];
Student *p=stud;
for(int j=0;j<5;j++)
{
stud[j].sl();
}
for(int i=0;i<=2;i++)
{
p->display();
p=p+2;
}
    return 0;
 }