
   EXTERN.H

   /* References to all extern variables */
   extern char date[9];     

   FILE #1

   #include "extern.h"
   char date[9]; 
   main()
         {
         strcpy ( date, "01-01-90" );
         foo();
         puts ( date );
        }

   FILE #2
 
    #include "extern.h"

     foo()
       {
       puts ( date );
       strcpy ( date, "02-02-90");
       puts (date );
       }

