对整数;了解一个符号运算符的行为（AMP） [英] Understanding the behavior of a single ampersand operator (&) on integers

问题描述

据我所知，单号操作符，通常用于按位与操作。 ？但是，任何人都可以帮助解释有趣的结果，你当你使用它比较两个数字之间

I understand that the single ampersand operator is normally used for a 'bitwise AND' operation. However, can anyone help explain the interesting results you get when you use it for comparison between two numbers?

例如;

(6 & 2) = 2
(10 & 5) = 0
(20 & 25) = 16
(123 & 20) = 16

有似乎是这些结果之间没有任何逻辑联系 - 我错过什么东西？联机文档只似乎是指布尔或单位的比较。

There seems to be no logical link between these results - am I missing something? Online documentation only seems to refer to the comparison of booleans or single bits.

推荐答案

比较各那些的二进制表示。

Compare the binary representations of each of those.

    110 &     010 =     010
   1010 &    0101 =    0000
  10100 &   11001 =   10000
1111011 & 0010100 = 0010000

在每一种情况下，一个数字是在结果1，只有当它为1时在两个左侧和右侧的输入。

In each case, a digit is 1 in the result only when it is 1 on both the left AND right side of the input.

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