Multiple definition of ***

[Chlaban]

Hello,
I have a question that is completely unrelated to STM, but I believe you can help me.
I would like to advise why I cannot use the following code and the message multiple definition comes out.
I will reduce the code to the necessary minimum.
I thought local variables in files only have local effect, can someone explain this to me?

Thank you

main:
#include "A.h"
#include "B.h"
void main() 
{}

A.h:
---------
A.c:
#include "A.h"
int i;
----------

B.h:
----------
B.c:
#include "B.h"
int i;

[AScha.3]

Hi,

https://letmegooglethat.com/?q=avoid+multiple+definition+header+file+c

read:

https://www.quora.com/What-are-some-ways-to-avoid-multiple-inclusion-of-the-same-header-file-in-C-programming

[mƎALLEm · Accepted solution]

Hello,

Declare int i as static:

static int i;