C++错误程序调试

main()中Student stud1(1001);的错误在哪#include <iostream>#include <string>using namespace std;class Student{public: Student(int n,){num=n;}virtual void display()=0;protected: int num;};class Graduate:public Student{public: Graduate(int n,float p):Student(n),pay(p){} void display( ){ cout<<num<<pay<<endl;} private: float pay;};int main(){ Student stud1(1001);Graduate grad1(2001,563.5);Student *pt;pt=&grad1;pt->display();return 0;收起