运行后如何对stu1和stu2进行赋值

#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 stu1,stu2;
int main()
{stu1.setdata();
stu2.setdata();
stu1.display();
stu2.display();
return 0;
}
求运行后如何对stu1和stu2进行赋值呀？？？？