hey everyone.
i am new in programming in c, so i am trying all these things just to get the hang of the code.
so i worte the following:
// file: q7a.h
static int err_code = 3;
void printErrCode ();
///////////// END OF FILE /////////////////
// file: q7a.c
#include <stdio.h>
#include "q7a.h"
void printErrCode ()
{
printf ("%d ", err_code);
}
///////////// END OF FILE /////////////////
// file: q7main.c
#include "q7a.h"
int main()
{
err_code = 5;
printErrCode ();
return 0;
}
///////////// END OF FILE /////////////////
so i ran the following in the makefile (i am using a Linux system)
gcc –Wall –c q7a.c –o q7a.o
gcc –Wall –c q7main.c –o q7main.o
gcc q7main.o q7a.o –o q7
the output is 3.
my question is why?
if you initialize a static variable (in fact any variable) in the header file, so if 2 files include the same header file (in this case q7.c and q7main.c) the linker is meant to give an error for defining twice the same var?
and why isnt the value 5 inserted into the static var (after all it is static and global)?
thanx