将-1转换为uint C＃

Question

Converting -1 to uint will not work "((uint)(-1))" solution?

num10 = ((uint)(-1)) >> (0x20 - num9);

Error: Constant value '-1' cannot be converted to a 'uint' (use 'unchecked' syntax to override)

Answer 1

Use

uint minus1 = unchecked((uint)-1);
uint num10 = (minus1) >> (0x20 - num9);

Or even better

uint num10 = (uint.MaxValue) >> (0x20u - num9);

Answer 2

The compiler is telling you what you need to do:

unchecked
{
     num10 = ((uint)(-1)) >> (0x20 - num9);
}

However, it may not give you the result you want.

Answer 3

An unsigned integer can represent positive values only. It can't represent -1.

If you want to represent negative values, you'll need to use a signed type, like int .

Answer 4

查找未选中的上下文。

Answer 5

You can indeed have something that resembles negative, unsigned numbers somewhat. They have the feature that x + (-x) == 0

To create a "negative" uint in c# without unchecked regions, you can instead use the equivalent (~x) + 1 which is the same as -x