我自己编的，可能大家有时会用上，函数小数转分数，限于整除分数，如1/8，5/4等

‘’函数实现小数转分数
Public Function XtoF(str As Currency, Optional fenm As Integer = 32) As String ‘’只限于整除分数
   Dim Cfm As Currency
   Dim cfmmod As Integer
   On Error GoTo Erroreof
   
   Cfm = 1 / fenm
   XtoF = ""
   If str = 0 Then XtoF = "": Exit Function
   
   Dim point As Integer
   Dim dInt As String
   Dim dPoint As Currency
   Dim fint, fint1, fint2 As Integer
   If str <> 0 Then
        If str > 1 Then
            point = InStr(1, str, ".", 1)
            If point = 0 Then
                XtoF = str:
                Exit Function
            Else
                dInt = Mid(str, 1, point - 1)
                dPoint = CCur("0." & Mid(str, point + 1))
                fint = InStr(1, XtoF(dPoint), "/", 1)
                fint1 = CInt(Mid(XtoF(dPoint), 1, fint - 1))
                fint2 = CInt(Mid(XtoF(dPoint), fint + 1))
                
                XtoF = CStr(dInt * fint2 + fint1) & "/" & CStr(fint2)
           
            End If
        Else
           If fenm Mod CInt(str / Cfm) = 0 Then
            XtoF = "1/" + CStr(fenm / CInt(str / Cfm))
           Else
              cfmmod = Maxgys(fenm, CInt(str / Cfm))
            XtoF = CStr(CInt(str / Cfm / cfmmod)) + "/" + CStr(CInt(fenm / cfmmod))
           End If
        End If
   Else
       XtoF = "0"
   End If
   Exit Function
Erroreof:
   XtoF = ""
End Function
Function Maxgys(num1 As Integer, num2 As Integer) As Integer
    Dim minnum, i As Integer
    minnum = num1
    If num1 > num2 Then minnum = num2
    For i = 1 To minnum
     If ((num1 Mod i) = 0) And ((num2 Mod i) = 0) Then Maxgys = i

  
    Next i
End Function

原文转自：http://www.ltesting.net