Powershell: appending a percent sign to the end of a variable

Question

I am trying to add the percent sign ("%") to append to a variable:

$disk = Get-WmiObject -ComputerName $Computer -Class Win32_LogicalDisk -Filter  "Caption = 'D:'"       
If (!($disk)) {
   $DiskpercentFree = "n/a"
}
Else {
   $deviceID = $disk.DeviceID 
   [float]$size = $disk.Size; 
   [float]$freespace = $disk.FreeSpace;  
   $diskpercentFree1 = [Math]::Round(($freespace / $size) * 100)
   $Percent = "%" 
   $diskpercentFree = $diskpercentFree1 + $Percent
}

But all I get is:

Cannot convert value "%" to type "System.Double". Error: "Input string was not in a correct format."

Presumably because it thinks that the "+" operator is making a calculation? I've tried various concat options but can't seem to get it right. Can anyone help?

Solution 1

Explanation:

Adding " " around your output to treat it as a string and then append the variable onto the end. This means you are able to switch it over from % to a string such as Percent Remaining.

Hope this helps, you were close!

Code:

   $disk = Get-WmiObject -ComputerName $Computer -Class Win32_LogicalDisk -Filter  "Caption = 'D:'"       
              If (!($disk)) {
                 $DiskpercentFree = "n/a"
                }  
              Else {
                 $deviceID = $disk.DeviceID 
                 [float]$size = $disk.Size; 
                 [float]$freespace = $disk.FreeSpace;  
                 $diskpercentFree1 = [Math]::Round(($freespace / $size) * 100)
                 $Percent = '%' 
                 $diskpercentFree = "$diskpercentFree1" + $Percent
                 }

Example Result of $diskpercentFree:

PS C:\Windows\system32> $DiskpercentFree

57%

Solution 2

There are a few ways to do this:

Assign variable as string:

$diskpercentFree = "$diskpercentFree1$Percent"

Cast the double value as a string:

$diskpercentFree = "$diskpercentFree1" + $Percent
# Or
$diskpercentFree = [string]$diskpercentFree1 + $Percent

And no need to use a separate variable for the % character:

$diskpercentFree = "$diskpercentFree1%"

Comments

[TOGEEK]

I chose $diskpercentFree = [String]$diskpercentFree1+"$Percent". I did actually try to convert the variable: "[String]$diskpercentFree". Thanks very much!

[arco444]

@JDGEEK then technically you should accept the other answer as that was the one that listed that method