用途：将十进制转化为二进制
输入：Dec(十进制数)
输入数据类型：Long
输出：DEC_to_BIN(二进制数)
输出数据类型：String
输入的最大数为2147483647,输出最大数为1111111111111111111111111111111(31个1)
Public Function DEC_to_BIN(Dec As Long) As String
DEC_to_BIN = ""
Do While Dec > 0
DEC_to_BIN = Dec Mod 2 & DEC_to_BIN
Dec = Dec / 2
Loop
End Function

用途：将二进制转化为十进制
输入：Bin(二进制数)
输入数据类型：String
输出：BIN_to_DEC(十进制数)
输出数据类型：Long
输入的最大数为1111111111111111111111111111111(31个1),输出最大数为2147483647
Public Function BIN_to_DEC(ByVal Bin As String) As Long
Dim i As Long
For i = 1 To Len(Bin)
BIN_to_DEC = BIN_to_DEC * 2 + Val(Mid(Bin,i,1))
Next i
End Function

用途：将十六进制转化为二进制
输入：Hex(十六进制数)
输入数据类型：String
输出：HEX_to_BIN(二进制数)
输出数据类型：String
输入的最大数为2147483647个字符
Public Function HEX_to_BIN(ByVal Hex As String) As String
Dim i As Long
Dim B As String

Hex = UCase(Hex)
For i = 1 To Len(Hex)
Select Case Mid(Hex,1)
Case "0": B = B & "0000"
Case "1": B = B & "0001"
Case "2": B = B & "0010"
Case "3": B = B & "0011"
Case "4": B = B & "0100"
Case "5": B = B & "0101"
Case "6": B = B & "0110"
Case "7": B = B & "0111"
Case "8": B = B & "1000"
Case "9": B = B & "1001"
Case "A": B = B & "1010"
Case "B": B = B & "1011"
Case "C": B = B & "1100"
Case "D": B = B & "1101"
Case "E": B = B & "1110"
Case "F": B = B & "1111"
End Select
Next i
While Left(B,1) = "0"
B = Right(B,Len(B) - 1)
Wend
HEX_to_BIN = B
End Function

用途：将二进制转化为十六进制
输入：Bin(二进制数)
输入数据类型：String
输出：BIN_to_HEX(十六进制数)
输出数据类型：String
输入的最大数为2147483647个字符
Public Function BIN_to_HEX(ByVal Bin As String) As String
Dim i As Long
Dim H As String
If Len(Bin) Mod 4 <> 0 Then
Bin = String(4 - Len(Bin) Mod 4,"0") & Bin
End If

For i = 1 To Len(Bin) Step 4
Select Case Mid(Bin,4)
Case "0000": H = H & "0"
Case "0001": H = H & "1"
Case "0010": H = H & "2"
Case "0011": H = H & "3"
Case "0100": H = H & "4"
Case "0101": H = H & "5"
Case "0110": H = H & "6"
Case "0111": H = H & "7"
Case "1000": H = H & "8"
Case "1001": H = H & "9"
Case "1010": H = H & "A"
Case "1011": H = H & "B"
Case "1100": H = H & "C"
Case "1101": H = H & "D"
Case "1110": H = H & "E"
Case "1111": H = H & "F"
End Select
Next i
While Left(H,1) = "0"
H = Right(H,Len(H) - 1)
Wend
BIN_to_HEX = H
End Function

用途：将十六进制转化为十进制
输入：Hex(十六进制数)
输入数据类型：String
输出：HEX_to_DEC(十进制数)
输出数据类型：Long
输入的最大数为7FFFFFFF,输出的最大数为2147483647
Public Function HEX_to_DEC(ByVal Hex As String) As Long
Dim i As Long
Dim B As Long

Hex = UCase(Hex)
For i = 1 To Len(Hex)
Select Case Mid(Hex,Len(Hex) - i + 1,1)
Case "0": B = B + 16 ^ (i - 1) * 0
Case "1": B = B + 16 ^ (i - 1) * 1
Case "2": B = B + 16 ^ (i - 1) * 2
Case "3": B = B + 16 ^ (i - 1) * 3
Case "4": B = B + 16 ^ (i - 1) * 4
Case "5": B = B + 16 ^ (i - 1) * 5
Case "6": B = B + 16 ^ (i - 1) * 6
Case "7": B = B + 16 ^ (i - 1) * 7
Case "8": B = B + 16 ^ (i - 1) * 8
Case "9": B = B + 16 ^ (i - 1) * 9
Case "A": B = B + 16 ^ (i - 1) * 10
Case "B": B = B + 16 ^ (i - 1) * 11
Case "C": B = B + 16 ^ (i - 1) * 12
Case "D": B = B + 16 ^ (i - 1) * 13
Case "E": B = B + 16 ^ (i - 1) * 14
Case "F": B = B + 16 ^ (i - 1) * 15
End Select
Next i
HEX_to_DEC = B
End Function
用途：将十进制转化为十六进制
输入：Dec(十进制数)
输入数据类型：Long
输出：DEC_to_HEX(十六进制数)
输出数据类型：String
输入的最大数为2147483647,输出最大数为7FFFFFFF
Public Function DEC_to_HEX(Dec As Long) As String
Dim a As String
DEC_to_HEX = ""
Do While Dec > 0
a = CStr(Dec Mod 16)
Select Case a
Case "10": a = "A"
Case "11": a = "B"
Case "12": a = "C"
Case "13": a = "D"
Case "14": a = "E"
Case "15": a = "F"
End Select
DEC_to_HEX = a & DEC_to_HEX
Dec = Dec / 16
Loop
End Function

用途：将十进制转化为八进制
输入：Dec(十进制数)
输入数据类型：Long
输出：DEC_to_OCT(八进制数)
输出数据类型：String
输入的最大数为2147483647,输出最大数为17777777777
Public Function DEC_to_OCT(Dec As Long) As String
DEC_to_OCT = ""
Do While Dec > 0
DEC_to_OCT = Dec Mod 8 & DEC_to_OCT
Dec = Dec / 8
Loop
End Function

用途：将八进制转化为十进制
输入：Oct(八进制数)
输入数据类型：String
输出：OCT_to_DEC(十进制数)
输出数据类型：Long
输入的最大数为17777777777,输出的最大数为2147483647
Public Function OCT_to_DEC(ByVal Oct As String) As Long
Dim i As Long
Dim B As Long

For i = 1 To Len(Oct)
Select Case Mid(Oct,Len(Oct) - i + 1,1)
Case "0": B = B + 8 ^ (i - 1) * 0
Case "1": B = B + 8 ^ (i - 1) * 1
Case "2": B = B + 8 ^ (i - 1) * 2
Case "3": B = B + 8 ^ (i - 1) * 3
Case "4": B = B + 8 ^ (i - 1) * 4
Case "5": B = B + 8 ^ (i - 1) * 5
Case "6": B = B + 8 ^ (i - 1) * 6
Case "7": B = B + 8 ^ (i - 1) * 7
End Select
Next i
OCT_to_DEC = B
End Function

用途：将二进制转化为八进制
输入：Bin(二进制数)
输入数据类型：String
输出：BIN_to_OCT(八进制数)
输出数据类型：String
输入的最大数为2147483647个字符
Public Function BIN_to_OCT(ByVal Bin As String) As String
Dim i As Long
Dim H As String
If Len(Bin) Mod 3 <> 0 Then
Bin = String(3 - Len(Bin) Mod 3,"0") & Bin
End If

For i = 1 To Len(Bin) Step 3
Select Case Mid(Bin,3)
Case "000": H = H & "0"
Case "001": H = H & "1"
Case "010": H = H & "2"
Case "011": H = H & "3"
Case "100": H = H & "4"
Case "101": H = H & "5"
Case "110": H = H & "6"
Case "111": H = H & "7"
End Select
Next i
While Left(H,Len(H) - 1)
Wend
BIN_to_OCT = H
End Function

用途：将八进制转化为二进制
输入：Oct(八进制数)
输入数据类型：String
输出：OCT_to_BIN(二进制数)
输出数据类型：String
输入的最大数为2147483647个字符
Public Function OCT_to_BIN(ByVal Oct As String) As String
Dim i As Long
Dim B As String

For i = 1 To Len(Oct)
Select Case Mid(Oct,1)
Case "0": B = B & "000"
Case "1": B = B & "001"
Case "2": B = B & "010"
Case "3": B = B & "011"
Case "4": B = B & "100"
Case "5": B = B & "101"
Case "6": B = B & "110"
Case "7": B = B & "111"
End Select
Next i
While Left(B,Len(B) - 1)
Wend
OCT_to_BIN = B
End Function

用途：将八进制转化为十六进制
输入：Oct(八进制数)
输入数据类型：String
输出：OCT_to_HEX(十六进制数)
输出数据类型：String
输入的最大数为2147483647个字符
Public Function OCT_to_HEX(ByVal Oct As String) As String
Dim Bin As String
Bin = OCT_to_BIN(Oct)
OCT_to_HEX = BIN_to_HEX(Bin)
End Function

用途：将十六进制转化为八进制
输入：Hex(十六进制数)
输入数据类型：String
输出：HEX_to_OCT(八进制数)
输出数据类型：String
输入的最大数为2147483647个字符
Public Function HEX_to_OCT(ByVal Hex As String) As String
Dim Bin As String
Hex = UCase(Hex)
Bin = HEX_to_BIN(Hex)
HEX_to_OCT = BIN_to_OCT(Bin)
End Function

VB自带函数：
十进制转八进制：Oct(num)
十六进制转八进制：oct("&H" & num)
十进制转十六进制：hex(num)
八进制转十六进制：hex("&O" & num)

十六进制转换为十进制 Dim str As String str = Text2.Text Text10.Text = CLng("&H" & str)