BigInteger.Parse() on hexadecimal number gives negative numbers.
Posted
by brickner
on Stack Overflow
See other posts from Stack Overflow
or by brickner
Published on 2010-06-06T09:30:53Z
Indexed on
2010/06/06
9:32 UTC
Read the original article
Hit count: 210
I've started using .NET 4 System.Numerics.BigInteger Structure and I've encountered a problem.
I'm trying to parse a string that contains a hexadecimal number with no sign (positive). I'm getting a negative number.
For example, I do the following two asserts:
Assert.IsTrue(System.Int64.Parse("8", NumberStyles.HexNumber, CultureInfo.InvariantCulture) > 0, "Int64");
Assert.IsTrue(System.Numerics.BigInteger.Parse("8", NumberStyles.HexNumber, CultureInfo.InvariantCulture) > 0, "BigInteger");
The first assert succeeds, the second assert fails. I actually get -8 instead of 8 in the BigInteger.
The problem seems to be when I'm the hexadecimal starts with 1 bit and not 0 bit (a digit between 8 and F inclusive). If I add a leading 0, everything works perfectly.
Is that a bad usage on my part? Is it a bug in BigInteger?
© Stack Overflow or respective owner
