Question

对于我的C ++入门课程的第二学期，我创建了一个名为Name.h的课程，其中包含以下信息：

#ifndef NAME_H
#define NAME_H

class Name
{
   private:
      string firstName;
      string lastName;
      string middleInitial;
   public:
      Name();
      Name(string, string, string);
      void setName(string, string, string);
      void setFirstName(string);
      void setLastName(string);
      void setMiddleInitial(string);
      void display() const;
      string getFirstName() const {
         return firstName;
      }
      string getLastName() const {
         return lastName;
      }
      string getMiddleInitial() const {
         return middleInitial;
      }
};

#endif

实施在文件Name.cpp中提供，如下所示：

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

#include "Name.h"

Name::Name() {}

Name::Name(string firstName, string lastName, string middleInitial) {
    this->firstName = firstName;
    this->lastName = lastName;
    this->middleInitial = middleInitial;
}

void Name::setName(string firstName, string lastName, string middleInitial) {
    this->firstName = firstName;
    this->lastName = lastName;
    this->middleInitial = middleInitial;
}

void Name::setFirstName(string firstName) {
    this->firstName = firstName;
}

void Name::setLastName(string lastName) {
    this->lastName = lastName;
}

void Name::setMiddleInitial(string middleInitial) {
    this->middleInitial = middleInitial;
}

void Name::display() {
    cout << firstName << " " << middleInitial << " " << lastName << endl;
}

最后，我尝试在下面的Name_Main.cpp文件中测试相应的函数和构造函数实现：

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

#include "Name.h"

int main() {
    string firstName;
    string lastName;
    string middleInitial;

    cout << "Using constructor: " << endl;
    cout << "Enter first name: ";
    cin >> firstName;

    cout << "Enter last name: ";
    cin >> lastName;

    cout << "Enter middle initial: ";
    cin >> middleInitial;

    Name name(firstName, lastName, middleInitial);
    cout << "Date: ";
    name.display();

    cout << "Using setName(): " << endl;;
    cout << "Enter first name: ";
    cin >> firstName;

    cout << "Enter last name: ";
    cin >> lastName;

    cout << "Enter middle initial: ";
    cin >> middleInitial;

    name.setName(firstName, lastName, middleInitial);
    cout << "Date: ";
    name.display();

    cout << "Using setters: " << endl;
    cout << "Enter first name: ";
    cin >> firstName;

    cout << "Enter last name: ";
    cin >> lastName;

    cout << "Enter middle initial: ";
    cin >> middleInitial;

    name.setFirstName(firstName);
    name.setLastName(lastName);
    name.setMiddleInitial(middleInitial);
    cout << "Date: ";
    name.display();

    return 0;
}

尝试使用Cloud9 IDE在Name_Main.cpp中测试类函数和构造函数后，我一直收到以下错误：

/tmp/cccNHMnU.o: In function `main':
Name_Main.cpp:(.text+0x126): undefined reference to `Name::Name(std::string, std::string, std::string)'

似乎Name_Main.cpp找不到Name.h中的相应方法及其在Name.cpp中的实现方式。我尝试将所有string变量类型更改为std::string中的Name.h变量类型，并将using namespace std;和#include <string>添加到头文件中，改为否无济于事。有谁知道为什么我收到这个错误，或者有解决这个问题的建议？

类构造函数和函数C ++的'undefined reference'

0 个答案: