use warnings;
use strict;

 our ( $var1, $var2 ) = ( 0, 0 );
  printf "var1: %s\tvar2:%s\n", $var1, $var2;
  require "conf";
  printf "var1: %s\tvar2:%s\n", $var1, $var2;

##</code><code>##

 $var1='x';
 $var2='y';