Blog_rosetta-code

1.ps1

function Get-HailStone
{
    param($n)
    switch($n) {
        {$_ -lt 1}     {return}
        1              {$n; return}
        {$n % 2 -eq 0} {$n; return Get-Hailstone ($n = $n / 2)}
        {$n % 2 -ne 0} {$n; return Get-Hailstone ($n = ($n * 3) +1)}
    }
}