### card.h ###
#ifndef CARD_H_
#define CARD_H_
#include <vector>
#include <string>
#include <iostream>
#endif

using namespace std;


struct Card {
	int suit, rank;
	void print () const;
	Card();
	Card(int s, int r);
	bool isGreater (const Card& c2);
};

vector<Card> deck (52);

bool equals (const Card& c1, const Card& c2);
void buildDeck();
void printDeck(const vector<Card>& deck);

### card.cpp ###
#ifndef CARD_H_
#define CARD_H_
#include <vector>
#include <string>
#include <iostream>
#endif

using namespace std;


struct Card {
	int suit, rank;
	void print () const;
	Card();
	Card(int s, int r);
	bool isGreater (const Card& c2);
};

vector<Card> deck (52);

bool equals (const Card& c1, const Card& c2);
void buildDeck();
void printDeck(const vector<Card>& deck);

### main.cpp ###
#include "card.h"

int main() {
	return 0;
}

### ERROR ###

**** Build of configuration Debug for project vector_objects ****

make all
Building file: ../test1/card.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"test1/card.d" -MT"test1/card.d" -o"test1/card.o" "../test1/card.cpp"
Finished building: ../test1/card.cpp

Building file: ../test1/main.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"test1/main.d" -MT"test1/main.d" -o"test1/main.o" "../test1/main.cpp"
Finished building: ../test1/main.cpp

Building target: vector_objects
Invoking: GCC C++ Linker
g++  -o"vector_objects"  ./test1/card.o ./test1/main.o
./test1/main.o: In function `main':
/usr/lib/gcc/i686-pc-linux-gnu/4.3.2/../../../../include/c++/4.3.2/new:105: multiple definition of `deck'
./test1/card.o:/home/johan/tdp004/workspace/vector_objects/Debug/../test1/card.cpp:48: first defined here
collect2: ld returned 1 exit status
make: *** [vector_objects] Error 1