这里有一些帖子，但似乎都没有提供完整的代码解决方案，所以我发布了这个，在互联网上从各种各样的想法中剔除（并在适当的时候记入）。 VB6没有任何功能可以从一个分数转换为一个十进制数，这是我正在研究的一个与膳食配方有关的项目所需要的。我考虑在.NET中编写DLL并将其插入我的应用程序，但最终决定采用这种方法。我希望这对其他人有用。以下解决方案将执行以下操作：
您提供一个十进制数字，您将以分组形式返回该分数。
您提供一个分数作为字符串，您将返回十进制数字。
在这两种情况下，都考虑了整数。 “2 3/4”（两个和四个季度）或“2.75”。
我确信代码效率不高，所以欢迎任何改进。
答案 0 :(得分：1)
将其复制/粘贴为新的类模块：
Option Explicit
Private ErrorNote As String
'Properties
Public Property Get GetAsFraction(numToConvert As Double) As String
On Error GoTo GetAsFraction_Error
GetAsFraction = FncGetAsFraction(numToConvert)
On Error GoTo 0
Exit Property
GetAsFraction_Error:
ErrorNote = "Number:" & Err.number & " (" & Err.Description & ") in procedure 'GetAsFraction' in 'ClsFractionDecimal'"
MsgBox (ErrorNote)
End Property
Public Property Get GetAsDecimal(fractionString As String) As Double
On Error GoTo GetAsDecimal_Error
GetAsDecimal = FncGetAsDecimal(fractionString)
On Error GoTo 0
Exit Property
GetAsDecimal_Error:
ErrorNote = "Number:" & Err.number & " (" & Err.Description & ") in procedure 'GetAsDecimal' in 'ClsFractionDecimal'"
MsgBox (ErrorNote)
End Property
'Functions - private
Private Function FncGetAsDecimal(fractionToConvert As String) As Double
Dim result As Double
Dim wholeNumber As Integer
Dim splitStr As Variant
Dim numerator As Integer
Dim denominator As Integer
Dim fractionString As String
Dim dividedByPos As Integer
On Error GoTo FncGetAsDecimal_Error
splitStr = Split(fractionToConvert, " ")
If UBound(splitStr) = 1 Then
wholeNumber = splitStr(0)
fractionString = splitStr(1)
Else
fractionString = splitStr(0)
End If
dividedByPos = InStr(1, fractionString, "/")
numerator = Left(fractionString, dividedByPos - 1)
denominator = Mid(fractionString, dividedByPos + 1)
result = Val(numerator) / Val(denominator) + wholeNumber
FncGetAsDecimal = result
On Error GoTo 0
Exit Function
FncGetAsDecimal_Error:
ErrorNote = "Number:" & Err.number & " (" & Err.Description & ") in procedure 'FncGetAsDecimal' in 'ClsFractionDecimal'"
MsgBox (ErrorNote)
End Function
Private Function FncGetAsFraction(numToConvert As Double) As String
Dim result As String
Dim numeratorCount As Integer
Dim denominator As Single
Dim multiplierStr As String
Dim i As Integer
Dim fractionNum As Single
Dim lowestCommonDenominator As Long
Dim wholeNumber As Integer
Dim decimalPos As Integer
On Error GoTo FncGetAsFraction_Error
If numToConvert > 0 Then
decimalPos = InStr(1, CStr(numToConvert), ".")
If decimalPos > 1 Then
wholeNumber = CStr(Mid(numToConvert, 1, decimalPos - 1))
numToConvert = CStr(Mid(numToConvert, decimalPos))
End If
numeratorCount = FncCountDecimalPlaces(numToConvert)
multiplierStr = "1"
For i = 1 To numeratorCount
multiplierStr = multiplierStr & "0"
Next i
fractionNum = numToConvert * Val(multiplierStr)
denominator = 1 * Val(multiplierStr)
result = FncCrunchFraction(fractionNum, denominator)
If result = "" Then result = fractionNum & "/" & denominator
If wholeNumber <> 0 Then result = wholeNumber & " " & result
Else
result = "ERROR"
End If
FncGetAsFraction = result
On Error GoTo 0
Exit Function
FncGetAsFraction_Error:
ErrorNote = "Number:" & Err.number & " (" & Err.Description & ") in procedure 'FncGetAsFraction' in 'ClsFractionDecimal'"
MsgBox (ErrorNote)
End Function
Private Function FncCountDecimalPlaces(num As Double) As Integer
Dim result As Integer
Dim numberStr As String
Dim i As Integer
Dim decimalPointPos As Integer
On Error GoTo FncCountDecimalPlaces_Error
numberStr = CStr(num)
If Len(numberStr) > 0 Then
i = 1
Do While i <= Len(numberStr) And decimalPointPos = 0
If Mid(numberStr, i, 1) = "." Then decimalPointPos = i
i = i + 1
Loop
End If
If i > 1 Then
result = (Len(numberStr) - i + 1)
End If
FncCountDecimalPlaces = result
On Error GoTo 0
Exit Function
FncCountDecimalPlaces_Error:
ErrorNote = "Number:" & Err.number & " (" & Err.Description & ") in procedure 'FncCountDecimalPlaces' in 'ClsFractionDecimal'"
MsgBox (ErrorNote)
End Function
'Credit to:
'http://www.tek-tips.com/viewthread.cfm?qid=206890
'dsi (Programmer) - 7 Feb 02 10:38
Private Function FncCrunchFraction(num1 As Single, num2 As Single) As String
Dim num As Single
Dim dem As Single
Dim cnt1 As Integer
Dim cnt2 As Integer
Dim numFactors() As Single
Dim demFactors() As Single
Dim common As Single
Dim i As Integer
Dim j As Integer
On Error GoTo FncCrunchFraction_Error
num = num1
dem = num2
For i = 2 To Int(num / 2) Step 1
If (num Mod i = 0) Then
cnt1 = cnt1 + 1
ReDim Preserve numFactors(1 To cnt1)
numFactors(cnt1) = i
End If
Next i
cnt1 = cnt1 + 1
ReDim Preserve numFactors(1 To cnt1)
numFactors(cnt1) = num
For i = 2 To Int(dem / 2) Step 1
If (dem Mod i = 0) Then
cnt2 = cnt2 + 1
ReDim Preserve demFactors(1 To cnt2)
demFactors(cnt2) = i
End If
Next i
cnt2 = cnt2 + 1
ReDim Preserve demFactors(1 To cnt2)
demFactors(cnt2) = dem
For i = cnt1 To 1 Step -1
For j = cnt2 To 1 Step -1
If (numFactors(i) = demFactors(j)) Then
common = numFactors(i)
FncCrunchFraction = num / common & "/" & dem / common
Exit Function
End If
Next j
Next i
FncCrunchFraction = ""
On Error GoTo 0
Exit Function
FncCrunchFraction_Error:
ErrorNote = "Line:" & Erl & " Number:" & Err.number & " (" & Err.Description & ") in procedure 'FncCrunchFraction' in 'ClsFractionDecimal'"
MsgBox (ErrorNote)
End Function
然后使用以下代码示例调用它：
Public Function DecimalToFraction(number As Double) As String
Dim myFractionDecimal As New ClsFractionDecimal
DecimalToFraction = myFractionDecimal.GetAsFraction(number)
Set myFractionDecimal = Nothing
End Function
Public Function FractionToDecimal(fractionString As String) As Double
Dim myFractionDecimal As New ClsFractionDecimal
FractionToDecimal = myFractionDecimal.GetAsDecimal(fractionString)
Set myFractionDecimal = Nothing
End Function