Error With Double Definitions Resulting from a Struct

[ScottyYDg]

Hello, I've recently been doing a modified version of my previous address book, but in a more simplified version. I have gotten the program to work when in one main.cpp, but upon splitting it up into a header and two cpp files, I run into variations of the same error. The error is:

main.obj : error LNK2005: "struct Person * person" (?person@@3PAUPerson@@A) already defined in addressBook.obj

No matter what I do, I run into similar or the same error, so I'm wondering what do I need to do to allow it to properly compile. Here is my code:

main.cpp

#include "addressBook.h"
#include <iostream>

using namespace std;

int main()

{

	char last[20];

	char choice;

	Person add;

	Person getStruct;

	cout << "Address Book" << endl << endl;

	while (true)

	{

		cout << endl << " Enter 1 to add to the address book. " << endl;

		cout << " Enter 2 to get a person. " << endl;

		cout << " Enter 3 to find a person by last name only." << endl;

		cout << " Enter 4 to print Book." << endl;

		cout << " Enter any other key to quit. " << endl;

		cout << endl << "Please make a selection: " << endl;

		cin >> choice;

		switch (choice)

		{

		case '1':

		{

			cout << "Enter First Name" << endl;

			cin >> add.firstname;

			cout << "Enter Last Name" << endl;

			cin >> add.lastname;

			cout << "Enter Address" << endl;

			cin.clear();

			cin.ignore(255, '\n');

			cin.getline(add.address, 40);

			addPerson(add);

			continue;

		}

		case '2':

		{

			cout << endl << "Getting the next person in the address book: " << endl << endl;

			getPerson(getStruct);

			printStruct(getStruct);

			continue;

		}

		case '3':

		{

			cout << "Please enter the last name to search for: " << endl;

			cin >> last;

			if (findPerson(last, add))

				printStruct(add);

			else

				cout << "Sorry could not find the name." << endl;

			continue;

		}

		case '4':

		{

			printBook();

			continue;

		}

		default:

		{

			return 0;

			break;

		}

		}

		cin.clear();

		cin.ignore(255, '\n');

	}

	return 0;

}
 

addressBook.cpp

#include <iostream>
#include "addressBook.h"

int head = 0;
int tail = -1;

using namespace std;

void printStruct(struct Person &print)

{

	cout << print.firstname << " " << print.lastname << endl;

	cout << print.address << endl;

}
bool addPerson(const Person p)
{

	if (head < MAXIMUM)

	{

		person[head] = p;

		head++;



		if (tail == -1)

			tail++;



		return true;

	}



	return false;

}
bool getPerson(Person &p)
{

	if (tail >= 0)

	{

		if (tail >= MAXIMUM)

			tail = 0;

		p = person[tail];

		tail++;

		return true;

	}

	return false;

}
bool findPerson(char *lName, Person &p)
{

	for (int i = 0; i < head; i++)

	{

		if (person[i].lastname, lName)

		{

			p = person[i];

			return true;

		}

	}

	return false;

}
void printBook()
{

	for (int i = 0; i < head; i++)

	{

		cout << person[i].firstname << "\t" << person[i].lastname << "\t" << person[i].address << endl;

	}

}

addressBook.h

#pragma once
#ifndef addressBook

#define addressBook

#include <string>

const int MAXIMUM = 10;
struct Person

{

	char firstname[20];

	char lastname[20];

	char address[50];

};

Person person[MAXIMUM];

void printStruct(Person &print);

bool addPerson(Person p);

bool getPerson(Person &p);

bool findPerson(char *lName, Person &p);

void printBook();

#endif 

[coder777]

You shall not define variables within headers. If global variables are really required declare them with extern in the header and put the definition in a cpp.