Powershell Function
Powershell Function
I am running the code shown below. I enter a value and it should return the Cubicle value of it.
However I do not understand where the outcome came from.
for instance, when I enter number 3 I should see 27, instead of the outcome shown below
Thank you
![f]()
I am running the code shown below. I enter a value and it should return the Cubicle value of it.
However I do not understand where the outcome came from.
for instance, when I enter number 3 I should see 27, instead of the outcome shown below
Thank you
Read-Host will treat the input as String, so you need to set it as Integer instead.
so try this instead
so try this instead
[int]$y=Read-Host("enter value: ")
It is PowerShell trying to think for you, you're giving it a string instead of a number so it assumes you want to repeat the characters. As a rule of thumb, when working with numbers you should cast your variables (e.g. [int], [double], etc.). This prevents something unexpected occurring. Ryan and David have both shown how to do that.
If you're going to do maths in PowerShell, you might as well use the built in libraries provided by .NET via the [math] accelerator; unless you're trying to learn to build your own libraries or functions as an education piece.
.NET has libraries for all of this so you do not have to re-invent the wheel. Because .NET has it, PowerShell has it.
Using this is simple.
Or
When casting, you will want to handle an exception from somebody passing it the wrong variable type, e.g. a string. This will prevent someone doing the following an causing the script or functional to terminally fail.
If you're going to do maths in PowerShell, you might as well use the built in libraries provided by .NET via the [math] accelerator; unless you're trying to learn to build your own libraries or functions as an education piece.
Function Get-PowerOf {
[CmdletBinding()]
Param(
[Parameter(Mandatory=$true,Position=0)]
[int] $Number,
[Parameter(Mandatory=$true,Position=1)]
[int] $Power
)
[math]::Pow($Number,$Power)
}
.NET has libraries for all of this so you do not have to re-invent the wheel. Because .NET has it, PowerShell has it.
Using this is simple.
Get-PowerOf -Number 3 -Power 3
Get-PowerOf 2 5
Get-PowerOf 5 2
1..10 | % {Get-PowerOf -Number 2 -Power $_}
Or
When casting, you will want to handle an exception from somebody passing it the wrong variable type, e.g. a string. This will prevent someone doing the following an causing the script or functional to terminally fail.
try {
Get-PowerOf "a" 3
} catch {
$_.exception.message
}
Should you wonder what PowerShell did read: It saw
"3" * "3" * "3"
and since there is no "string * string" operator but a "string * integer", it converts the second string into a number. "string * integer" means "repeat the string n times". So the expression is
("3" * 3) * "3" ==> "333" * "3" ==> "333" * 3 ==> "333333333"
"3" * "3" * "3"
and since there is no "string * string" operator but a "string * integer", it converts the second string into a number. "string * integer" means "repeat the string n times". So the expression is
("3" * 3) * "3" ==> "333" * "3" ==> "333" * 3 ==> "333333333"
Write-Host ($result ) -> You cannot access the value of $result this way since $result is local to that function. It is not available externally. so $result is $null here (ie out of the function) it is displaying $null value so you are not seeing any thing on display.
The output is from this -> Get-cube($y)
The output is from this -> Get-cube($y)