external integer constant

this is working fine but it does pr开发者_Python百科oduce a warning:

extern int const SCREEN_WIDTH;

Need I be concerned about doing this? It functions exactly as intended.

The warning I get is:

SCREEN_WIDTH initialized and declared extern

and

extern variable has an initializer

Sounds like where you set the SCREEN_WIDTH constant's value, you still have the extern keyword. Something like:

extern int const SCREEN_WIDTH = 1024;

If so, remove the extern keyword. It should only be present where you declare the constant, not where you define it. :)