C ++错误：标识符“类名”未定义

Question

I have just started to use classes in C++. As a first object-oriented project, I want to program a character creator for a Pen and Paper game.

I have created the class structure including inheritance.

This is an example class:

#include "Characters.cpp"
#include "Fighter.cpp"
#include "Dwarf.cpp"

class FighterDwarf : public Characters, public Fighter, public Dwarf {

public:
    string test = "Hello, I am a fighter dwarf!";

    void testPrint() {
        cout << test << endl;
    }

    FighterDwarf() {

    }
};

And here is main:

#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    FighterDwarf fighterDwarf;
    fighterDwarf.testPrint();
    return 0;
}

In case it is not obvious, they are in two different files/Items. I don't think it is important but they are also in two different folders.

The problem is that I get the error message "Error: identifier "FighterDwarf" is undefined.

It is most likely a beginner mistake. I would guess that I must somehow declare "FighterDwarf" in the main file before I can create an instance of the class. If this is the case, I don't know how to do that with classes.

By they way, I know that there are a lot of people out there not liking multiple inheritance but I have chosen to use C++ and not Java because of that very feature.

SOLVED: If I want to do everything in a single file, I need to do that in the header. Which I will, as some of the classes have some more code which I don't want to rewrite right now. Furthermore, I find it easier tow work with one file than two, at least at the beginning where I have more important things to mind. But I will split the classes up into two in my very next program. By the way, why is it so important to split classes up? Isn't it easier to work with one class?

Answer 1

It has nothing to do with classes. Your main.cpp file simply needs to #include the header file which declares and/or defines your FighterDwarf class.