use Foobar;

if (1) {
  Foobar::foovar(7);
  print "1. The value is now ", Foobar::foovar(), "\n";

  Foobar::foovar(9);
  print "2. The value is now ", Foobar::foovar(), "\n";
}
else {
  Foobar::foovar_once(7);
  print "1. The value is now ", Foobar::foovar_once(), "\n";

  Foobar::foovar_once(9);
  print "2. The value is now ", Foobar::foovar_once(), "\n";
}