PowerShell
param(
[string] $optionalparam1, #an optional parameter with no default value
[string] $optionalparam2 = "default", #an optional parameter with a default value
[string] $requiredparam = $(throw ""requiredparam required."), #throw exception if no value provided
[string] $user = $(Read-Host -prompt "User"), #prompt user for value if none provided
[switch] $switchparam; #an optional "switch parameter" (ie, a flag)
)
.... rest of function code here ....