SSRS: NaN, Infinity or even #Error

I’ve seen many IIF’s, CASE-statements, +0.00001 additions and others to suppress or solve one of these ‘errors’:
NaN, Infinity or even #Error

Let’s start with the basics, when do these things emerge and why?
Normally, you get NaN when trying to divide 0 / 0 or Infinity when you are dividing any number by 0.

I personally use this function to overcome such obstacles:
Public Function Divide(ByVal dividend As Double, ByVal divisor As Double) As Double
If IsNothing(divisor) Or divisor = 0 Or IsNothing(dividend) Or dividend = 0 Then
Return 0
Else
Return dividend / divisor
End If
End Function

And here’s how you should use it:
=Code.Divide(X,Y)

Other more creative solutions are:
=REPLACE(X/Y,"NaN","0")
Or:
=IIF(Y = 0, 0, X/Y)
Or:
=Switch(
X/Y = "NaN",Nothing,
X/Y = "Infinity",Nothing,
X/Y = "Infinity",Nothing
)

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