编译器错误:未在作用域中声明

我正在尝试为我创建的几个类测试我的代码，但在尝试编译时遇到了一些困难。我有三节课和一节主课。第一类是人类，第二类和第三类是从人衍生出来的学生和教师。以下是我为Person.h类提供的内容：

#ifndef Person_H
#define Person_H
#include <string>
using namespace std;
class Person
{
 protected:
  long id;
  string name;
  string email;
  string address;
  string dateOfBirth;
  string gender;
 public:
  Person(long pId);
  Person(long pId, string pName, string pEmail, string pAddress, string pDateOfBirth, string pGender);
  void print() const;
};
#endif

这是我的人。C

#include <iostream>
#include "Person.h"
using namespace std;
Person::Person(long pId)
{
  id = pId;
  name = "Nothing";
  email = "Nothing";
  address = "Nothing";
  dateOfBirth = "Nothing";
  gender = "Nothing";
}
Person::Person(long pId, string pName, string pEmail, string pAddress, string pDateOfBirth, string pGender)
{
  id = pId;
  name = pName;
  email = pEmail;
  address = pAddress;
  dateOfBirth = pDateOfBirth;
  gender = pGender;
}
void Person::print() const
{
  cout << "ID: " << id << endl;
  cout << "Name: " << name << endl;
  cout << "Email: " << email << endl;
  cout << "Address: " << address << endl;
  cout << "Date of Birth: " << dateOfBirth << endl;
  cout << "Gender: " << gender << endl;
}

这是Student.h

#ifndef Student_H
#define Student_H
#include<string>
#include <vector>
#include "Person.h"
#include "Course.h"
using namespace std;
class Student:public Person
{
 protected:
  int yearOfStudy;
  string major;
  long advisorId;
  vector <Course> coursesTaken;
  static long nextStId;
 public:
  Student();
  Student(string sName, string sEmail, string sAddress, string sDateOfBirth, string sG
ender, int sYearOfStudy, string sMajor, long sAdvistorId);
  void print() const;
};
#endif

这是学生.C

#include<iostream>
#include "Student.h"
using namespace std;
long Student::nextStId = 500;
Student::Student():Person(nextStId)
{
  yearOfStudy = 0;
  major = " ";
  advisorId = 0;
}
Student::Student(string sName, string sEmail, string sAddress, string sDateOfBirth, st
ring sGender, int sYearOfStudy, string sMajor, long sAdvisorId):Person(nextStId, sName
, sEmail, sAddress,sDateOfBirth, sGender)
{
  yearOfStudy = sYearOfStudy;
  major = sMajor;
  advisorId = sAdvisorId;
}
void Student::print() const
{
  Person::print();
  cout << "Year of study: " << yearOfStudy << endl;
  cout << "Major: " << major << endl;
  cout << "Advisor ID: " << advisorId << endl;
}

现在，我主要有：

#include <iostream>
#include <string>
#include "Faculty.h"
#include "Student.h"
#include "Person.h"
using namespace std;
int main()
{
  Student test1;
  Faculty test2;
  test1.print();
  cout << endl;
  test2.print();
  return 0;
}

当我尝试编译时收到的错误是：

 g++ Assignment3.C Person.C Student.C Faculty.C
Assignment3.C: In function âint main()â:
Assignment3.C:10: error: âStudentâ was not declared in this scope
Assignment3.C:10: error: expected `;' before âtest1â
Assignment3.C:12: error: âtest1â was not declared in this scope

我不明白为什么它会给我那个错误。我的教员班似乎运行得很好。有人能帮忙吗！