什么是C＃一个符号的第二个含义是什么？ [英] What is the second meaning of a single ampersand in C#?

问题描述

我已经使用了单号（&安培;）在C＃中的意思是检查第二的条件，即使是第一次声明中的假。

但下面似乎是&放一个不同的意义 干脆，可以谁能解释如何 I和1 在下面的示例

 列表< INT>分数=新的List< INT> {1，2，3，4，5，6，7，8}; 
变种evenScores = scores.Where（ⅰ= I标记％2 == 0）; 
变种evenScores2 = scores.Where（ⅰ= GT;（I和1）== 0）; 
  

解决方案

一个单独的放大器&;是按位与运算符，就像鸽子说。我看问题的第二部分：为什么？它的工作原理

想想二进制：

  000 = 0 
 001 = 1 
 010 = 2 
 011 = 3 
 100 = 4 
 101 = 5 
 110处= 6 
 111 = 7 
等
  

请注意所有偶数数字0结束;因此，如果对1返回最后位按位检查零（意思是不匹配），它是一个偶数;

I have used the single ampersand (&) in C# to mean "check the second conditional statement even if the first is false".

But the following seems to be a different meaning of & altogether, can anyone explain how i & 1 works in the following example?

List<int> scores = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8 };
var evenScores = scores.Where(i => i % 2 == 0);
var evenScores2 = scores.Where(i => (i & 1) == 0);

解决方案

A single & is "Bitwise AND operator", just like dove said. I'm looking at second part of question: "why it works?"

Think in binary:

 000 = 0
 001 = 1
 010 = 2
 011 = 3
 100 = 4
 101 = 5
 110 = 6
 111 = 7
 and so on

Note all even numbers ends with 0; so if last bit bitwise check against 1 returns zero (meaning "doesn't match"), its a even number;

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