[Dev-C++] Macro problem

[Farzan H. <far...@ho...>]

Hi,
Please help me with the following code. We have three files: a header fil=
e =20
and two
implementation files.

// Source of "header.h"
#ifndef HEADER_H
#define HEADER_H

int p;

#endif
--------------------------------
// Source of "main.cpp"
#include <cstdio>
#include "header.h"

int main()
{
     printf("%i\n",p);
     return 0;
}
--------------------------------
// Soruce of "func.cpp"
#include "header.h"
int func()
{
     return p;
}

The compiler generates the error " multiple definition of 'p' ".
What is wrong with the code?
When the header file is included for the first time, the macro "HEADER_H"=
 =20
is defined
but when the header file is included in the second implementation file,
"HEADER_H" can not be recognized in the second file and "p" is defined =20
once more!!
It seems macros have file scope.

Thanks,


--=20
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