title: Powershell adding numbers in a loop
body: <p>I have the below code which is meant to total up the time offset as the loop rotates (I will then need to divide this by 10 to get the average but first I need to get this bit working).</p>
  
  <p>I'm assuming I need to cast something as [INT] but I've tried multiple locations that would make sense to no avail. I just end up with O's.</p>
  
  <pre><code>$winTimeStripchart = w32tm /stripchart /computer:0.pool.ntp.org /dataonly /samples:10
  $WinTimeOffset = $null
  
  For($i=3; $i -le 12; $i++){
  
      $Offset = $winTimeStripchart[$i].split("-")
      $trimmedOffset = $Offset[1].trim("s")
      $winTimeOffset  = $winTimeOffset + $trimmedOffset
  }
  
  Write-Host "Total: $winTimeOffset"
  # Now need to divide by 10. 
  </code></pre>
  
  <p>sample data:</p>
  
  <pre><code>20:30:23, -00.0698082s
  20:30:25, -00.0704645s
  20:30:27, -00.0708694s
  20:30:29, -00.0728990s
  20:30:31, -00.0719226s
  20:30:33, -00.0749031s
  20:30:36, -00.0778656s
  20:30:38, -00.0782183s
  20:30:40, -00.0752974s
  20:30:42, -00.0760958s
  </code></pre>