Android Question Hex to Decimal

[kaudie]

Why do I get an error when I try this?

Dim Str_HexNumber As String
Str_HexNumber = "DA2DDE56"
Dim Int_Number As Int
Int_Number = Bit.ParseInt(Str_HexNumber, 16)

The error is:
java.lang.NumberFormatException: Invalid int: "DA2DDE56"

thanks

 

[imbault]

You should use ByteConverter library
have a look on:
https://www.b4x.com/android/forum/threads/hexa-to-real-parsereal-string-int-as-real-in-ba4.22153/

 

[kaudie]

It give me a negative value "-634528170". With an Internet-converter I get the correct value "3660439126".
Why is that?

 

[James Chamblin]

It seems that ParseInt() will not work with values above $7FFFFFFF. I do know that $80000000 is greater than the maximum Int, but I would think that it would just simply roll the extra bit into the sign bit, just like this example

    Dim Int_Number As Int = 0x80000000
    Log(Int_Number)

 

[James Chamblin]

typed my reply at the same time as yours. The reason that it is negative is because the largest value that can be held by an Int is 2147483647 ($7fffffff). When you write a larger value to the Int, the extra bit is written to the sign bit, giving you a negative value. Anything larger than $FFFFFFFF will most likely be truncated to the lowest 32 bits.

 

[MaFu]

Java doesn't know unsigned variables, only the signed types exist. Maybe using a Long instead an Int could help.