Thread: Problem with class header please help

Hello
i have a problem.... i am trying to split a cpp file, where i have the class declaration, class implementation and main, into three separate files.
So i have created dataset.h with the following code:

Code:

#if !defined(DATASET_H)
#define DATASET_H

class DataSet
{
public: .....
private......
}
#endif

The file dataset.cpp with:
#include "dataset.h"

DataSet::DataSet
{
}
.... and  the other member functions declarations.

and the file main.cpp with

#include "dataset.h"
and the main function, where i call some public member functions of class DataSet. When i compile, it says:
Linker error: undefined symbol dataset::function1 in module main
and the same for all the functions i try to call.

What did i do wrong? The program worked perfectly before trying to split it.

Thank you very much.