继承的问题，求助！！

#include"iostream"
#include"string"
using namespace std;
class Person
{ public:
   Person(string n,string s,int a)
   {name=n;sex=s;age=a;}
   void display()
   { cout<<"姓名:"<<name<<endl;
     cout<<"性别："<<sex<<endl;
     cout<<"年龄："<<age<<endl;
   }
protected:
   string name;
   string sex;
   int age;
};
class Teacher:virtual public Person
{ public:
 Teacher(string n,string s,int a,string t,string l)
     :Person(n,s,a)
 { title=t;
   lesson=l;
 }
 void display()
 { Person::display();
   cout<<"职称："<<title<<endl;
   cout<<"担任课程："<<lesson<<endl;
 }
protected:
    string title;
    string lesson;
};
class Student:virtual public Person
{ public:
  Student(string n,string s,int a,string no,string d)
      :Person(n,s,a)
  { num=no;
    depa=d;
  }
  void display()
  { Person::display();
    cout<<"学号："<<num<<endl;
    cout<<"系别"<<depa<<endl;
  }
protected:
    string num;
    string depa;
};
class Graduate:public Student
{
public:
 Graduate(string n,string s,int a,string no,string d,string tn)
     :Person(n,s,a),Student(n,s,a,no,d)
 { tname=tn;
 }
 void display()
 { Student::display();
   cout<<"导师:"<<tname<<endl;
 }
private:
    string tname;
};
int main()
{ Teacher teac("黄奕","女","教授",48,"面向对象程序设计");//报错了。是怎么回事
  Student stud("罗志祥","男",18,"2007082011","计算机");
  Graduate grad("贺军翔","男",24,"2004082011","计算机系","胡歌");
  cout<<"教师的有关数据如下："<<endl;
  teac.display();
  cout<<"\n学生的有关数据如下："<<endl;
  stud.display ();
  cout<<"\n研究生的有关数据如下："<<endl;
  grad.display();
  return 0;
}




E:\VC++\8.cpp(65) : error C2664: '__thiscall Teacher::Teacher(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,int,class s
td::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)' : cannot convert parameter 3 from 'char [5]' to 'int'
        This conversion requires a reinterpret_cast, a C-style cast or function-style cast
执行 cl.exe 时出错.