#include <stdio.h>

/* 
   gcc -ansi -c b*.c    => b1.o, b2.o, b3.o
   gcc -ansi -o b  b*.o => b
   The order of object files for the link command has no significance
*/
extern int a, b;

int a = 5;  /* global variable a */
int b = 2; /* global variable b - can be accesed from any file */

void f1(void);
void f2(void);

main()
{
  f1();
  f2();
  printf("\nFrom main:  a = %d  b = %d\n", a, b);
}