long类型溢出
问题描述:
我试图做一些质因数分解与我的VBA Excel和我打了long
数据类型的限制 -long类型溢出
运行时错误6溢出
有什么办法解决这个问题,仍然留在VBA内?我知道显而易见的是使用另一种更合适的编程语言。
Lance's solution到目前为止,我能够将大数目变成现在的变量。然而,当我尝试应用MOD
功能 - bignumber MOD 2
,例如 - 它仍然失败,错误消息
运行时错误6溢出
答
MOD正在尝试将DECIMAL类型转换为LONG,然后再对其进行操作。您可能需要为DECIMAL类型编写自己的MOD功能。你可以试试这个:
r = A - Int(A/B) * B
其中A & B是Variant变量十进制亚型和r可能必须是大也(根据您的需要),虽然我只在很长的测试。
答
这是我Decimals.cls(VB6):
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "Decimals"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = True
Attribute VB_Ext_KEY = "SavedWithClassBuilder6" ,"Yes"
Attribute VB_Ext_KEY = "Top_Level" ,"Yes"
Option Explicit
'local variable(s) to hold property value(s)
Private mvarDec As Variant 'local copy
Public Property Let Dec(ByVal vData As Variant)
'used when assigning a value to the property, on the left side of an assignment.
'Syntax: X.Dec = 5
mvarDec = CDec(vData)
End Property
Public Property Get Dec() As Variant
Attribute Dec.VB_UserMemId = 0
'used when retrieving value of a property, on the right side of an assignment.
'Syntax: Debug.Print X.Dec
Dec = CDec(mvarDec)
End Property
,这是一个测试程序。这个类已经设置好,所以你不必在.dec()上获取和让出。
Dim dec1 As New Std.Decimals
Dim dec2 As New Std.Decimals
Dim dec3 As New Std.Decimals
Dim modulus As New Std.Decimals
Sub main()
dec1 = "1000.000000001"
dec2 = "1000.00000000000001"
dec3 = dec1 + dec2
Debug.Print dec1
Debug.Print dec2
Debug.Print dec3
Debug.Print dec3 * dec3
Debug.Print dec3/10
Debug.Print dec3/100
Debug.Print Sqr(dec3)
modulus = dec1 - Int(dec1/dec2) * dec2
Debug.Print modulus
End Sub
和样品运行
1000.000000001
1000.00000000000001
2000.00000000100001
4000000.000004000040000001
200.000000000100001
20.0000000000100001
44.721359550007
0.00000000099999
1000.000000001
1000.00000000000001
2000.00000000100001
4000000.000004000040000001
200.000000000100001
20.0000000000100001
44.721359550007
0.00000000099999
答
这里是我的 “大乘” 例程乘以任意大的数字(例如100个字符)。它通过将输入数字(字符串)拆分为7位数字块(因为它可以将它们交叉相乘并将结果存储在双精度中)。
如bigmultiply( “1934567803945969696433”, “4483838382211678”)= 8674289372323895422678848864807544574
Function BigMultiply(ByVal s1 As String, ByVal s2 As String) As String
Dim x As Long
x = 7
Dim n1 As Long, n2 As Long, n As Long
n1 = Int(Len(s1)/x + 0.999999)
n2 = Int(Len(s2)/x + 0.999999)
n = n1 + n2
Dim i As Long, j As Long
ReDim za1(n1) As Double
i = Len(s1) Mod x
If i = 0 Then i = x
za1(1) = Left(s1, i)
i = i + 1
For j = 2 To n1
za1(j) = Mid(s1, i, x)
i = i + x
Next j
ReDim za2(n2) As Double
i = Len(s2) Mod x
If i = 0 Then i = x
za2(1) = Left(s2, i)
i = i + 1
For j = 2 To n2
za2(j) = Mid(s2, i, x)
i = i + x
Next j
ReDim z(n) As Double
Dim u1 As Long, u2 As Long
Dim e As String
e = String(x, "0")
For u1 = 1 To n1
i = u1
For u2 = 1 To n2
i = i + 1
z(i) = z(i) + za1(u1) * za2(u2)
Next u2
Next u1
Dim s As String, y As Double, w As Double, m As Long
m = n * x
s = String(m, "0")
y = 10^x
For i = n To 1 Step -1
w = Int(z(i)/y)
Mid(s, i * x - x + 1, x) = Format(z(i) - w * y, e)
z(i - 1) = z(i - 1) + w
Next i
'truncate leading zeros
For i = 1 To m
If Mid$(s, i, 1) <> "0" Then Exit For
Next i
If i > m Then
BigMultiply = ""
Else
BigMultiply = Mid$(s, i)
End If
End Function
我想你知道,你只需要寻找系数最大为ROOT(N) – dbb 2008-11-18 07:37:27