Correct or Not or Old-fashioned or Bug

[Zhou Mi]

When I am working in a project, I find that someone in my group write
the following program. Though it seems work well, I still wonder if it
is correct or better ??

-----file 1 (named pro_all.h) ---------
	int i;

------file 2 (named pro_main.c) --------
	#include "pro_all.h"
	
	void main()
	{
		sub1();
		sub2();
		sub3();
	}
	
--------- file 3 (named pro_sub1.c) --------
	#include "pro_all.h"
	void sub1()
	{
		i = 1;
	}

--------- file 4 (named pro_sub2.c) ---------
	#include "pro_all.h"
	void sub2()
	{
		i++;
	}

--------- file 5 (named pro_sub3.c) ---------
        #include "pro_all.h"
        void sub3()
        {
		i += 3;
	}

	If anyone has the result, please mail to me.

	my E-mail address is:
			zhoumi at nff.ncl.omron.co.jp
--
+------
 From:   Zhou  Mi

 ||=======||{}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~{}
 ||\    / ||{} Zhou Mi, RZE, Systems R&D LAB., OMRON Co.                    {}
 || \  /  ||{} E-mail:   zhoumi at nff.ncl.omron.co.jp                         {}
 ||  \/   ||{} TEL:  075-951-5111  x   3176                                 {}
 ||  /\   ||{}=============================================================={}
 || /     ||{} What is AI ? This is the very question that AI machine can   {}
 ||/      ||{} answer, but one can not !!                                   {}
 ||=======||{}______________________________________________________________{}