CPP-1,2 header and code separation problem

[JimJeon]

I need to separate code from header files.
And http://www.cplusplus.com/forum/articles/10627/ read this!

[JimJeon]

• add CPP-2 practice makefile
• CPP-2 assignment error occurs

[taeguk]

Good. And Using initializing list when initialize member variables in constructor is more better thand initializing in constructor body(means inside { ... } ).

class Bad {
    Data data;
public:
    Bad(const Data& data) { this->data = data; }
};
class Good {
    Data data;
public:
    Good(const Data& data) : data(data) { }
};

Bad constructor calls Data::Data() and Data::operator=(const Data& data).
Good constructor calls Data::Data(const Data& data).