Need help with preprocessor directives

[Joelito]

Hi, been a while
This is my problem:

// main.c
#include "header.h"
//...

// app.c
#include "header.h"
//...

// header.h
#ifndef MYH
const int value = 10;
#define MYH
#endif
//...

mingw32 says that there are multiple definition of value...any ideas why #ifndef is not working as suppose to be? Thanks

[cpjust]

Try declaring value as extern, then define it once in a .c file.

[Salem]

> any ideas why #ifndef is not working as suppose to be?
Because include guards only work to prevent you including same thing twice within a single source file.

Multiple definition errors come from the linker, not the compiler.

Note that you wouldn't have this problem of having an initialised const in a header file if this were C++.