Question:
I have a database of strings of hex numbers and I want to convert them to decimal. There doesn’t seem to be a function for it, but can you go the other way with the HEX function?
e.g. "A" converts to 10.e.g. "AB" needs to convert to 171.
Answer:
Here’s a little snippet of code that will do the trick:
Sub Main() Const Original = "AB12C" Dim lngValue As Long Dim strChar As String Dim intCharValue As Integer Dim i As Integer For i = 0 To Len(Original) - 1 strChar = Mid(Original, Len(Original) - i, 1) Select Case strChar Case 0 To 9 intCharValue = Int(strChar) Case "A", "B", "C", "D", "E", "F" intCharValue = Asc(strChar) - 55 End Select lngValue = lngValue + (intCharValue * (16 ^ i)) Next i End Sub
When you’re finished, lngValue will have the decimal value of the constant specified.
On Feb. 18th, 2000, DevX reader Kevin Palmer suggested this alternative to the above code:
Sub Main()Const Original = "AB12C"Dim lngValue As Long lngValue = Val( "&H" & Original) End Sub
On Feb. 22nd, 2000, DevX reader Eric Hood responded:
Basic has a conversion method available:
d = val("&H" + h$)
where h$ = the hexidecimal valueand d = decimal value.
Example:
?val("&H3F") 63
On Feb. 23rd, 2000, DevX reader Bryan Hapeman responded:
I was able to convert a hex string to decimal with the following code:
Dim Hex_String as StringDim Number as Double Number = val("&h" & Hex_String)
Doesn’t that work?
