ld:Xcode 中架构x86_64的 1 个重复符号

我一直在为这个而努力。我已经搜索了所有内容，我似乎发现的都是具有相同错误消息的问题，但涉及构建完整的iPhone应用程序或处理头文件，各种各样的东西。

我只是在编写一个简单的C++程序，我希望所有类都放在一个文件中，因为我很懒惰。不确定这是否是问题所在。这是针对一个非常简单的大学作业，但我无法继续工作，因为 Xcode 给了我这个与实际代码无关的错误(基于我所阅读的内容)。除了实际的.cpp文件之外，我没有搞砸任何东西，我什至不知道我怎么能搞砸这个。我以相同的方式完成了多项作业，以前从未遇到过这个问题。

//
//  Devin Shawn Tripp
//  Student ID: 11199100
//  CSCE 1040!
//  Hw2
//
//  Created by Devin Tripp on 2/26/18.
//  Copyright © 2018 Devin Tripp. All rights reserved.
//

// 6 classes - main is not a class

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include "Classes.cpp"
using namespace std;

int main(int argc, const char * argv[]) {
/* Declare Variables */
//Students stud;
int choice = 0;

/* Create Menu */
while (choice != 4) {
printf("What do you want to do: n");
printf("1: Add new Course n2: Add New Student n3: Add Enrollment n4: Quit n");
cin >> choice;

switch (choice) {
case 1:
//do something
// inventory.additem();
break;
case 2:
//do something
//stud.addStudent();
break;
case 3:
//do something
// sales.addOrder();
break;
case 4:
//do something
exit(0);
break;

default:
break;
}

}

return 0;
}

下面的文件显然包含将在main.cpp中使用的所有类。

//
//  Classes.cpp
//  Hw2
//
//  Created by Devin Tripp on 2/28/18.
//  Copyright © 2018 Devin Tripp. All rights reserved.
//
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include "Classes.hpp"
using namespace std;
#define CHUNKSIZE 2

class Courses {
public:
private:
};
class Student {
public:
void setId(int id) { stud_id = id;}
int getId() { return stud_id;}
void setName(string na) { name = na; }
string getName() { return name;}
private:
int stud_id;
string name;
};

class Students {
public:
Students() {stud_cnt = 0; stud_cap = CHUNKSIZE; studs = new Student[CHUNKSIZE];}
~Students() { delete [] studs;}
void addStudent();
private:
int stud_cnt;
int stud_cap;
Student *studs;

};
void Students::addStudent() {
int id;
string temp;
if (stud_cnt == stud_cap) {
Student *temp;
temp = new Student[stud_cap + CHUNKSIZE];
for (int i = 0;i < stud_cnt; i++) {
temp[i] = studs[i];
}
delete [] studs;
stud_cap += CHUNKSIZE;
studs = temp;
}
printf("Enter a new student ID: ");
cin >> id; cin.ignore();
printf("Enter Name: ");
cin >> temp; cin.ignore();
cout << " Got data " << temp << endl;
studs[stud_cnt].setId(id); cout << "Set ID" << endl;
studs[stud_cnt].setName(temp); cout << "Set Name" << endl;
stud_cnt += 1; cout << "inc stud count" << endl;


}

我没有使用头文件，尽管我认为问题可能出在上面，因为我没有在其中声明类。我认为你应该这样做。

这是我收到的错误消息。

Ld /Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Products/Debug/Hw2 normal x86_64
cd "/Users/devintripp/Desktop/swift projects/Hw2"
export MACOSX_DEPLOYMENT_TARGET=10.13
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -L/Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Products/Debug -F/Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Products/Debug -filelist /Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Intermediates.noindex/Hw2.build/Debug/Hw2.build/Objects-normal/x86_64/Hw2.LinkFileList -mmacosx-version-min=10.13 -Xlinker -object_path_lto -Xlinker /Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Intermediates.noindex/Hw2.build/Debug/Hw2.build/Objects-normal/x86_64/Hw2_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -stdlib=libc++ -Xlinker -dependency_info -Xlinker /Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Intermediates.noindex/Hw2.build/Debug/Hw2.build/Objects-normal/x86_64/Hw2_dependency_info.dat -o /Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Products/Debug/Hw2
duplicate symbol __ZN8Students10addStudentEv in:
/Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Intermediates.noindex/Hw2.build/Debug/Hw2.build/Objects-normal/x86_64/Classes.o
/Users/devintripp/Library/Developer/Xcode/DerivedData/Hw2-dpzrwrfmzkaytqajxohtoaipzmkh/Build/Intermediates.noindex/Hw2.build/Debug/Hw2.build/Objects-normal/x86_64/main.o
ld: 1 duplicate symbol for architecture x86_64