# DecToFrac – Converts a decimal number into a fraction

``' Converts a decimal value into fractional parts as integers' (based on the concept of Continued Fractions)' Examples of usage:' Call DeclToFrac(0.125, a, b)   ' 1 and 8 are returned in a & b' Call DecToFrac(5/40, a, b)     ' 1 and 8 are also returned' Call DecToFrac(2/3, a, b)      ' 2 and 3 are returned' Since more than one value needs to be returned, they are returned' to variables which are passed by reference as arguments (Numerator' and Denom) to the DecToFrac Sub procedureSub DecToFrac(DecimalNum As Double, Numerator As Long, Denom As Long)   ' The BigNumber constant can be adjusted to handle larger fractional parts   Const BigNumber = 50000   Const SmallNumber = 1E-16   Dim Inverse As Double, FractionalPart As Double   Dim WholePart As Long, SwapTemp As Long   Inverse = 1 / DecimalNum   WholePart = Int(Inverse)   FractionalPart = Frac(Inverse)   If 1 / (FractionalPart + SmallNumber) < BigNumber Then        ' Notice that DecToFrac is called recursively.          Call DecToFrac(FractionalPart, Numerator, Denom)        Numerator = Denom * WholePart + Numerator        SwapTemp = Numerator        Numerator = Denom        Denom = SwapTemp   Else ' If 1 / (FractionalPart + SmallNumber) > BigNumber        ' Recursion stops when the final value of FractionalPart is 0 or        ' close enough.  SmallNumber is added to prevent division by 0.        Numerator = 1        Denom = Int(Inverse)   End IfEnd Sub' This function is used by DecToFrac and DecToProperFactFunction Frac(x As Double) As Double    Frac = Abs(Abs(x) - Int(Abs(x)))End Function' This additional procedure handles "improper" fractions and returns' them in mixed form (a b/c) when the numerator is larger than the denominatorSub DecToProperFrac(x As Double, a As Long, b As Long, c As Long)   If x > 1 Then a = Int(x)   If Frac(x) <> 0 Then       Call DecToFrac(Frac(x), b, c)   End IfEnd Sub'#####################################################################'#'# This item has been brought to you by Daniel Corbier, the author of'# UCalc Fast Math Parser, a component which allows programs to'# evaluate expressions that are defined at runtime. You can learn'# more and download a fully functional copy at www.ucalc.com/mathparser'#'#####################################################################``

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