Help me understand C ++ header files and classes

Question

OK, so I'm trying to switch from intermediate Delphi to object-oriented programming in C ++. I read the Ivar Horton book in Visual C ++ 2010. I can get rid of simple console applications without problems. I get the language itself (kinda). Where I struggle with headings and classes.

I also understand that header files and classes in general. What I don't get is an implementation when I use a header or class? Do I need to create classes for everything I do? Can my actual working functions be in header files or in CPP files? I get lost in the correct use of this data and can use some real recommendations from more experienced programmers.

I am trying to switch to Windows applications using MFC if this is useful.

Answer 1

I also understand what header files and classes in general. That I cannot get an implementation when to use a header or class? Do I have to create classes for everything I do? Do I need my actual work functions? be in header files or in CPP files? I am lost in the correct use of these and may use some kind of guidance in the real world from more experienced programmers.

Repeat for several years, and I would have the same question - this is not something that is very well covered, I don’t think. So let me break the part that I see as the meat of your problem.

Do I need to create classes for everything I do?

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#include <iostream>
using namespace std;

int testadd()
{
    int a = 4; int b = 2; int c = add(a, b);
    return c;
}

int add(int x, int y)
{
    return x + y;
}

int main(int argc, char** argv)
{
    cout << "result is: " << c << endl;
    return 0;
}

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