Question

我正在努力制作一个拥有＆＃34; Class University＆＃34;包含＆＃34;类部门＆＃34;的矢量; [矢量部门]。在＆＃34;类部门内部＃34;在公共场合我有两个构造函数和一个打印函数。

在我的University.cpp中，我正在尝试创建一个添加新对象Department的函数，并将其放入＆＃34; University＆＃34;中的向量部门。我相信我做错了，因为我试图在大学函数中调用Department（）的构造函数，我收到此错误消息：

$ g++ University.cpp
/usr/li`enter code here`b/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
/tmp/cc6XExwc.o: In function `University::CreateNewDepartment(std::string, std::string, long)':
University.cpp:(.text+0x7d): undefined reference to `Department::Department(std::string, std::string, long)'
collect2: error: ld returned 1 exit status

Class Departments具有以下私有变量（long id，string name，string location，long chairID）。我是否需要使用set（）函数来创建对象，如果是这样，我将如何进行此操作？

下面的University.h

#include <string>
#include <vector>
#include <iostream>
#include <fstream>
using namespace std;


#include "Person.h"
#include "Student.h"
#include "Faculty.h"
#include "Department.h"
#include "Course.h"

class University
{

 protected:
  vector<Department> Departments;
  vector<Student> Students;
  vector<Course> Courses;
  vector<Faculty> Faculties;


 public:
  University();
  ~University();

  bool CreateNewDepartment(string depName, string depLoc, long depChairId);

下面的University.cpp

#include <string>
#include <vector>
#include <iostream>
#include <fstream>
using namespace std;


#include "University.h"

bool University::CreateNewDepartment (string n, string l, long c)
{
  if ( (c != 0) && (!validFaculty (c) ))
    return false;

  Department D (n, l, c);

   Departments.push_back (D);

  return true;
}

Department.h

#ifndef DEPARTMENT_H
#define DEPARTMENT_H


#include <string>
#include <iostream>
using namespace std;


class Department
{
  friend class University;
 protected:
  long id;
  string name;
  string location;
  long chairId;
  static long nextDepartId;

 public:
  Department();
  Department(string n, string l, long c);
  void Print() const;
};
#endif

Department.cpp

#include "Department.h"
using namespace std;
#include <string>

long Department::nextDepartId;

Department::Department()
{
id = chairId = 0;
name = location = " ";
}

Department::Department(string n, string l, long c)
{
name = n;
location = l;
chairId = c;
}

void Department::Print() const
{
cout << "Name:     " << name << endl;
cout << "Id:       " << id << endl;
cout << "Location: " << location << endl;
cout << "Chair id: " << chairId << endl;
}

Answer 1

正如@SteveHolodnak和@ M.M.的评论中所述，这里有两个未定义的引用问题。

没有主要功能。
对Department::Department()

使用g++ main.cpp University.cpp Department.cpp其中main.cpp是您的主要功能的文件应解决您的所有问题。

包含其他类向量的c ++类

1 个答案: