Functions/Get-Round.ps1
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# Inspired by: https://stackoverflow.com/questions/41700200/how-to-correctly-round-numbers-in-powershell function Get-Round { <# .SYNOPSIS Correctly rounds a number. Optionally can specify the number of digits to round to. .DESCRIPTION Correctly rounds a number. Optionally can specify the number of digits to round to. Default behavior for [math]::Round is to round [System.MidpointRounding]::ToEven so 2.5 would round to 2 as opposed to expected behavior of rounding to 3. Without this [math]::Round(0.25, 1) will round to 0.2 as opposed to what it should of 0.3. .PARAMETER Number The number to round. Can be a single number, or an array of numbers. Positional parameter. Accepts pipeline input. .PARAMETER Digit The number of digits after the decimal point. Defaults to 0. .PARAMETER IncludeOriginal A switch to determine if you want the input parameters to be included in the output .NOTES Inspired by: https://stackoverflow.com/questions/41700200/how-to-correctly-round-numbers-in-powershell .EXAMPLE Get-Round 2.5 Returns a properly rounded value of 3. .EXAMPLE Get-Round 2.45 -Digit 1 Returns a properly rounded value of 2.5. .EXAMPLE Get-Round -Number 2.45 -Digit 1 -IncludeOriginal # Would return Original Digits Rounded -------- ------ ------- 2.45 1 2.5 .EXAMPLE 2.45, 3.22, 7.26 | Get-Round -Digit 1 -IncludeOriginal # Would return Original Digits Rounded -------- ------ ------- 2.45 1 2.5 3.22 1 3.2 7.26 1 7.3 .OUTPUTS [double] .LINK https://social.msdn.microsoft.com/Forums/vstudio/en-US/0221d962-26e6-4a7e-be7a-72cd669a0dfc/why-systemmathround0251-2?forum=vbgeneral Talks about Visual Basic but the same info applies to Powershell. #> #region parameter [CmdletBinding(ConfirmImpact='Low')] [OutputType('double')] Param ( [parameter(Mandatory,HelpMessage='Enter the number you wish to be rounded',Position=0,ValueFromPipeline)] [double[]] $Number, [parameter(Position=1)] [int] $Digit = 0, [switch] $IncludeOriginal ) #endregion parameter begin { } process { foreach ($currentNumber in $Number) { $ReturnVal = [double] [math]::Round($currentNumber, $Digit, [System.MidpointRounding]::AwayFromZero) if ($IncludeOriginal) { New-Object -TypeName 'psobject' -Property ([ordered] @{ Original = $currentNumber Digits = $Digit Rounded = $ReturnVal }) } else { $ReturnVal } } } end { } } |