perl -Mstrict -we '
  my @arr = (0..10);
  printf("%d "x@arr, @arr);
'

__output__
0 1 2 3 4 5 6 7 8 9 10
[download]

or 'join' option...

perl -Mstrict -we '
  my @arr = (0..10);
  printf("%s", join(" ", @arr));
'

__output__
0 1 2 3 4 5 6 7 8 9 10
[download]

EDIT:

Yes, I know I could build an output string by looping over the array, but I am trying to learn about sprintf. :)

Sorry if 'join'-ish type option above was something OP already tried...