Re: [Mingw-users] Initializing an extern array

Thanks a lot! It worked!

On Fri, Nov 21, 2008 at 9:50 AM, Sylvester <syl...@gm...>wrote:

>  Greg Chicares wrote:
>
> [Please don't top-post:
>   http://en.wikipedia.org/wiki/Posting_style#Top-posting
> Thanks.]
>
> On 2008-11-21 02:40Z, Sylvester Steele wrote:
>
>
>  I am basically declaring an extern array in a file say global1.h. The I am
> using it in 2-3 other files. I include this file.
>
> I declare it like this:
>
> extern int outputs[4];
>
>
>  This declaration enables you to access and use the variable,
> as long as it's defined elsewhere. I'd generally omit the
> dimension '4' here: then you don't have to change it in the
> header when you change it in the definition.
>
>
>
>  to use this extern array I do:
>
> int outputs[4]; - this outside of any function, in file that I want to
> access the extern variable.
>
>
>  That's a definition. You need exactly one definition, in
> exactly one file. The 'extern' declaration enables the
> variable defined here to be accessed elsewhere.
>
>
>
>  If I do this in 1 file only (ie declaration an 1 file and use in 1 more
> different file) the program compiles.
>
> However if I use it more than one file (declaration an 1 file and use in 2
> or more different files) it does not compile.
>
>
>  One declaration is sufficient for you to use the variable in
> any file that includes the header containing the declaration.
> You don't have to repeat the definition: in fact, it's an error.
> A definition allocates space. You want to allocate space only
> once for a variable.
>
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>
>
>  Thanks a lot. I'll try this.
>