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'Returns input number rounded to specified number of significant figures.
Function FormatSF(dblInput As Double, intSF As Integer) As String
Dim intCorrPower As Integer 'Exponent used in rounding calculation
Dim intSign As Integer 'Holds sign of dblInput since logs are used in calculations
FormatSF = "0" 'default
'-- Store sign of dblInput --
intSign = Sgn(dblInput)
If dblInput <> 0# Then 'dblInput cannot be zero or Log10 will crash
'-- Calculate exponent of dblInput --
intCorrPower = Int(Log10(Abs(dblInput)))
FormatSF = Round(dblInput * 10 ^ ((intSF - 1) - intCorrPower)) 'integer value with no sig fig
FormatSF = FormatSF * 10 ^ (intCorrPower - (intSF - 1)) 'raise to original power
'-- Reconsitute final answer --
'FormatSF = FormatSF * intSign 'deactivated to fix negative values
'-- Answer sometimes needs padding with 0s --
If InStr(FormatSF, ".") = 0 Then
If Len(FormatSF) < intSF Then
FormatSF = Format(FormatSF, "##0." & String(intSF - Len(FormatSF), "0"))
End If
End If
If intSF > 1 And Abs(FormatSF) < 1 Then
Do Until Left(Right(FormatSF, intSF), 1) <> "0" And Left(Right(FormatSF, intSF), 1) <> "."
FormatSF = FormatSF & "0"
Loop
End If
End If
End Function
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