Unresolved external symbol with headers and linker

[Ryusko]

I'm having trouble properly defining and using headers. To preface, I'm a Java programmer just starting to learn C++. Basically, what I'm trying to do is to create a new Character and then make sure the functions are working (default constructor, parameterized constructor, setStr, and getStr). Here's the main class, source, and header files:

Character.h:

class Character{

private:
	int str;
public:
	void setStr(int i);
	int getStr();
	Character();
	Character(int i);

};

Character.cpp:

#include "Character.h"

int str;

void setStr(int i){
	str = i;
}

int getStr(){
	return str;
}

Character :: Character(){
	Character(-1);
}

Character :: Character(int i){
	setStr(i);
}

main.cpp:

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

using namespace std;

int main(char args, char* argv){
	int stall;
	Character ch;
	cout << ch.getStr();
	cin >> stall;
}

build log:

1>  main.cpp
1>  Character.cpp
1>  Generating Code...
1>Character.obj : error LNK2019: unresolved external symbol "public: void __thiscall Character::setStr(int)" (?setStr@Character@@QAEXH@Z) referenced in function "public: __thiscall Character::Character(int)" (??0Character@@QAE@H@Z)
1>main.obj : error LNK2019: unresolved external symbol "public: int __thiscall Character::getStr(void)" (?getStr@Character@@QAEHXZ) referenced in function _main
1>c:\users\jacob\documents\visual studio 2010\Projects\Balance\Debug\Balance.exe : fatal error LNK1120: 2 unresolved externals

I'm unclear exactly which bits of information goes into the header and which goes into the source, I'm guessing the error is a result of having some definitions in the wrong file, but basic guessing and checking and google-fu have been fruitless.

[Hippogriff]

You need to include those functions inside the class in the .cpp file.

Change int getStr() to int Character::getStr() so the the header file knows which function you are referring to.

[Ryusko]

That fixed it up, thanks. As a follow up question, why do I not need to use

using namespace Character;

in the main method and I'm still able to reference stuff from Character directly, while I have to use std::cout if I don't declare that I'm using the standard namespace?

[Moschops]

Character is not a namespace. It's a class; a kind of object you can make. Classes and namespaces are completely different things.