“无符号”关键词 [英] The "unsigned" keyword

问题描述

我在一些C ++代码中看到以下形式的关键字unsigned：

  const int HASH_MASK = unsigned 1）> 1; 
  

及更高版本：

  unsigned hash = HASH_SEED; 
  

（取自Stanford的CS106B / X阅读器 - 作者：Eric S. Roberts - on

有人可以告诉我这个关键字是什么意思，我什么时候使用它？ p>

谢谢！

解决方案

查看： http://stackoverflow.com/a/7176690/1758762

unsigned是一个可以应用于任何整数类型（char，
short，int，long等）的修饰符，但是它本身与无符号
int相同。

I saw in some C++ code the keyword "unsigned" in the following form:

const int HASH_MASK = unsigned(-1) >> 1;

and later:

unsigned hash = HASH_SEED;

(it is taken from the CS106B/X reader - of Stanford - by Eric S. Roberts - on the topic of "implementation of the hash code function for strings").

Can someone tell me please what does that keyword mean and when do I use it anyway?

Thanks!

解决方案

Take a look: http://stackoverflow.com/a/7176690/1758762

unsigned is a modifier which can apply to any integral type (char, short, int, long, etc.) but on its own it is identical to unsigned int.

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