c++程序编译时出现 error LNK2019，无法解析的外部符号在 main中被引用
这是main文件main.cpp，信息查询
#include "sys.cpp"
#pragma comment(lib,"ws2_32.lib")
using std::cout;
using std::cin;
using std::endl;
int main(int argc, char const *argv[])
{
cout << "请选择你要操作的内容:" << endl;
cout << "1 学生基本" << endl;
cout << "2 教师基本信息录入" << endl;
cout << "3 学生信息查询" << endl;
cout << "4 教师信息查询" << endl;
cout << "5 " << endl ;
int i;
cin >>i;
while(i!=5){
int in_id;
char* in_name="n";
char* in_sex = "n";
int in_age;
int in_phone;
char* in_job = "n";
if (i==1)
{
cout << "学号: 姓名: 性别: 年龄: 电话: "<<endl;
cin >> in_id >> in_name >> in_sex >> in_age >> in_phone ;
Student student_temp(in_id, in_name, in_sex, in_age, in_phone);
break;
}
else if (i==2)
{
cin >> in_id >> in_name >> in_sex >> in_age >> in_phone >> in_job;
cout << "工号: 姓名: 性别: 年龄: 电话: 职称: " <<endl;
Teacher teacher_temp(in_id, in_name, in_sex, in_age, in_phone, in_job);
break;
}在编译的时候，会报出fatal error2019.
我把创建对象的构造函数注释掉再编译就没有问题，那么问题就出在构造函数。
这是在sys.h头文件里构造器的声明。
#ifndef _SYS_H
#define _SYS_H
class Person
{
int ID ;
char *name;
char *sex;
int age;
int phone;
public:
Person(int in_id, char* in_name, char* in_sex, int in_age, int in_phone);
Person();
~Person();
class Student : public Person
{
public:
Student(int in_id, char* in_name, char* in_sex, int in_age, int in_phone);
void static StudentSearch(int);
~Student();
};
class Teacher : public Person
{
char *job;
public:
Teacher(int in_id, char* in_name, char* in_sex, int in_age, int in_phone, char* in_job);
void static TeacherSearch(int);
~Teacher();
};
#endif
这是sys.cpp文件里构造器的定义。
Person::Person(int in_id, char* in_name, char* in_sex, int in_age, int in_phone)
{
ID = in_id;
name = in_name;
sex = in_sex;
age = in_age;
phone = in_phone;
}
Student::Student(int in_id, char* in_name, char* in_sex, int in_age, int in_phone) : Person(in_id, in_name, in_sex, in_age, in_phone)
{
ofstream data("Student data.txt");
data << in_id << in_name << in_sex << in_age << in_phone << endl;
}
Teacher::Teacher(int in_id, char* in_name, char* in_sex, int in_age, int in_phone, char* in_job):Person(in_id, in_name, in_sex, in_age, in_phone)
{
job = in_job;
ofstream data("Teacher data.txt");
data << in_id << in_name << in_sex << in_age << in_phone << in_job <<endl;
}为什么会出现这样的错误呢？在网上找了许多相关的解决方法但是并没有成功。
