Programming Fundamentals/Conditions/PowerShell

conditions.ps1

# This program asks the user for a Fahrenheit temperature, 
# converts the given temperature to Celsius,
# and displays the results.
#
# References:
#     https://www.mathsisfun.com/temperature-conversion.html
#     https://en.wikiversity.org/wiki/PowerShell/Conditions

function Get-Choice()
{
    Write-Host "Enter C to convert to Celsius or F to convert to Fahrenheit:"
    $choice = Read-Host
    return $choice
}

function Get-Temperature($label)
{
    Write-Host "Enter $label temperature:"
    $temperature = Read-Host
    return $temperature
}

function Calculate-Celsius($fahrenheit)
{
    $celsius = ([double]$fahrenheit - 32) * 5 / 9
    return $celsius
}

function Calculate-Fahrenheit($celsius)
{
    $fahrenheit = [double]$celsius * 9 / 5 + 32
    return $fahrenheit
}

function Display-Result($temperature, $from, $result, $to)
{
    Write-Host $($temperature + '° ' + $from + ' is ' + $result + '° ' + $to)
}

function Main()
{
    # Main could either be an if-else structure or a switch-case structure

    $choice = Get-Choice

    # If-Else approach
    if($choice -eq 'C' -or $choice -eq 'c')
    {
        $temperature = Get-Temperature "Fahrenheit"
        $result = Calculate-Celsius $temperature
        Display-Result $temperature "Fahrenheit" $result "Celsius"
    }
    elseif($choice -eq 'F' -or $choice -eq 'f')
    {
        $temperature = Get-Temperature "Celsius"
        $result = Calculate-Fahrenheit $temperature
        Display-Result $temperature "Celsius" $result "Fahrenheit"
    }
    else 
    {
        Write-Host 'You must enter C to convert to Celsius or F to convert to Fahrenheit.'
    }

    # Switch-Case approach
    switch ($choice)
    {
        C 
        {
            $temperature = Get-Temperature "Fahrenheit"
            $result = Calculate-Celsius $temperature
            Display-Result $temperature "Fahrenheit" $result "Celsius"
        }

        F
        { 
            $temperature = Get-Temperature "Celsius"
            $result = Calculate-Fahrenheit $temperature
            Display-Result $temperature "Celsius" $result "Fahrenheit"
        }

        default { Write-Host 'You must enter C to convert to Celsius or F to convert to Fahrenheit.' }
    }
}

Main

Try It

Copy and paste the code above into one of the following free online development environments or use your own PowerShell compiler / interpreter / IDE.

Online

• There are some options, but none are fully functional at this time.

Windows

• Microsoft:Starting Windows PowerShell

macOS / Linux

• HowToGeek: How to Install Microsoft PowerShell on Linux or OS X

See Also

• Microsoft: Getting Started with PowerShell
• PowerShell

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