Re: [Dev-C++] Global variables (linking errors)

[Graeme F. <gr...@dr...>]

On a slightly different tack, it is often desirable to have a header file
included multiple times. However that may cause problems if you end up with
multiple definitions. To avoid that header guards should be used. These will
have a pre-processor directive around the entire file

#ifndef __MyHeaderFile_H
#define __MyHeaderFile_H

// add some declarations and definitions here...

#endif

This will expand the code only once but allow the file to be included
multiple times. Now all you have to be wary of is circular #includes, where
file A includes B and B includes A. That causes the compiler to get terribly
frustrated.

Graeme.