如何将有符号整数转换为无符号整数? [英] How can I convert a signed integer into an unsigned integer?

问题描述

这段代码就像:-

int x = -24;  
uint y = (uint) x;  
Console.WriteLine("*****" + y + "********");  
// o/p is *****4294967272********  

为什么在C#中这种类型的行为，详细的阐述会有所帮助.谢谢大家.

Why this type of behavior in C#, Detailed elaboration would be helpful. Thankyou all.

推荐答案

负数(如-24)表示为二进制补码，请参见

Negative numbers (like -24) are represented as a binary complement, see

en.wikipedia.org/wiki/Two's_complement

有关详细信息.就您而言

for details. In your case

   24     = 00000000000000000000000000011000
  ~24     = 11111111111111111111111111100111
  ~24 + 1 = 11111111111111111111111111101000 =
          = 4294967272

将int强制转换为uint时要小心，因为-24超出了 uint范围([0..uint.MaxValue])，因此可能会抛出OverflowException.更安全的实现是

When casting int to uint be careful, since -24 is beyond uint range (which [0..uint.MaxValue]) you can have OverflowException being thrown. A safier implementation is

 int x = -24;  
 uint y = unchecked((uint) x); // do not throw OverflowException exception  

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