C++ - .h and .cpp
If I have a `.h` file that contains the following for example:

    class A
    {
    ...
    }

Notice that there is no customized constructor here.

Now, in the `.cpp` file, can I write the following:

    A
    {
    ...
    }

Thanks.
C++ - .h and .cpp
===

If I have a `.h` file that contains the following for example:

    class A
    {
    ...
    }

Notice that there is no customized constructor here.

Now, in the `.cpp` file, can I write the following:

    A
    {
    ...
    }

Thanks.