Powershell:队列的实现

cls
$maxQueueConut =5
$queneCount =0
$queueHead =0
$queuetail =0
$queue = New-Object int[] ($maxQueueConut)

function EnQueue([int] $Value)
{
   if($queneCount -eq $maxQueueConut)
   {
     throw "quene is full"
   }
   else
   {
      $script:queneCount++
      $script:queue[$queueHead] = $Value
   }
   $script:queueHead = NextIndex $queueHead
   "Enqueue:$Value queneCount=$queneCount queueHead=$queueHead queuetail=$queuetail Queue = $queue "
}
function DeQueue
{
   if($queneCount -eq 0)
   {
     throw "queue is empty"
   }
   else
   {
      $script:queneCount--
      $returnValue =$queue[$queuetail]
   $script:queuetail = NextIndex $queuetail
   }
   "Dequeue:$returnValue queneCount=$queneCount queueHead=$queueHead queuetail=$queuetail Queue = $queue"
}
function NextIndex([int] $currentIndex)
{
  if($currentIndex -eq $maxQueueConut-1)
  {
     $currentIndex =0
  }
  else
  {
     $currentIndex++
  }
  return $currentIndex
}

 

测试代码：

 

EnQueue 1
EnQueue 2
EnQueue 5
EnQueue 4
EnQueue 6

DeQueue
DeQueue
DeQueue
DeQueue

EnQueue 3

 

结果：

Enqueue:1 queneCount=1 queueHead=1 queuetail=0 Queue = 1 0 0 0 0
Enqueue:2 queneCount=2 queueHead=2 queuetail=0 Queue = 1 2 0 0 0
Enqueue:5 queneCount=3 queueHead=3 queuetail=0 Queue = 1 2 5 0 0
Enqueue:4 queneCount=4 queueHead=4 queuetail=0 Queue = 1 2 5 4 0
Enqueue:6 queneCount=5 queueHead=0 queuetail=0 Queue = 1 2 5 4 6
Dequeue:1 queneCount=4 queueHead=0 queuetail=1 Queue = 1 2 5 4 6
Dequeue:2 queneCount=3 queueHead=0 queuetail=2 Queue = 1 2 5 4 6
Dequeue:5 queneCount=2 queueHead=0 queuetail=3 Queue = 1 2 5 4 6
Dequeue:4 queneCount=1 queueHead=0 queuetail=4 Queue = 1 2 5 4 6
Enqueue:3 queneCount=2 queueHead=1 queuetail=4 Queue = 3 2 5 4 6