Param
(
  [parameter(Mandatory=$true, HelpMessage="The barcode value")]
  [string]$bc
)

$ret = $false
if ($bc.Length -gt 1) {
  $pruefZiffer = $bc[$bc.Length - 1] - 48

  $sum = 0

  $len = $bc.Length - 1

  for ($i = 0; $i -lt $len; $i++) {
    $dig = $bc[$i] - 48
    if ($i % 2 -eq 0) {
      $sum += 3 * $dig
    } else {
      $sum += $dig
    }
  }


  $computedZiffer = 10 - ($sum % 10)

  if ($computedZiffer -eq $pruefZiffer) { $ret = $true }
}
$ret) { $ret = $true }
}
$ret