OJ对象数组输入与输出

#include <iostream>
#include <iomanip>
using namespace std;
class Student
{
public:
Student(int n=0,double g=0);
void input();
void display();
private:
int  num;
double grade;
};
Student::Student(int n,double g)
{
num=n;
grade=g;
}
void Student::input()
{
cin>>num>>grade;
}
void Student::display()
{
cout<<num<<"  "<<grade<<endl;
}
int main()

{

const int NUM=10;

Student stud[NUM];

int n,i;

cin>>n;

for(i=0; i<n; i++)

stud[i].input();

cout<<setiosflags(ios::fixed);

cout<<setprecision(2);

Student *p=stud;

for(i=0; i<n; p+=2,i+=2)

p->display();

return 0;

}