各位高人，这个C++程序哪个地方不对啊？怎么只能输入一组数据啊?

#include <iostream>
using namespace std;
class Student
{private:
    int num;
    int score;
 public:
    void setdata()
    {
        cin>>num;
        cin>>score;
    }
    void display()
    {
        cout<<"num="<<num<<endl;
        cout<<"score="<<score<<endl;
    }
};
Student stud1,stud2;
int main()
{
    stud1.setdata();
    stud2.setdata();
    stud1.display();
    stud2.display();
    return 0;
}