Global Variable In C

#include"conio.h"
#include"stdio.h"
int i;
main()
{
clrscr();
call1();
call2();
printf("%d\n",i);
call1();
printf("%d\n",i);
call2();
printf("%d\n",i);
getch();
}
call1()
{
i++;
printf("%d\n",i);
}
call2()
{
printf("%d\n",i);
i++;
}