Compile main and class source.

[Jaehunt]

Hi, I am new to D. I have no experience any language background.

I have main function calling class "ABC" and class "ABC".

I save separately like main.d and classABC.d.

When I compile "dmd main.d classABC.d", it says "main.d(45);
Error: undefined identifier ABC".

How can i solve it?