for( 0..9 ) {
   my $num0 = "1.$_";
   my $num1 = "1.0$_";
   my $num2 = "1.00$_";
   printf "$num0 => %0.0f  $num1 => %0.1f  $num2 => %0.2f\n",
       $num0, $num1, $num2;
   printf "$num0 => %0.20f  $num1 => %0.20f  $num2 => %0.20f\n",
       $num0, $num1, $num2;
   print "\n";
}