&是什么和|运营商吗?它们与&&有何不同?和||?迅速 [英] What do the & and | operators do? How are they different from && and ||? Swift

问题描述

我已经看到许多使用|或&的实例，但是我不了解它们的用途.我知道&&和||的含义，但是我想知道它们与单个字符对应的区别.同样，如果有人可以向我展示使用|和&的示例(请在Swift 2中)，那将是很棒的.谢谢

I've seen many instances where | or &are used, but I haven't understood what they are used for. I know what && and || mean, but I would like to know the difference between them and their single character counterparts. Also, it would be great if someone could show me examples of where | and & are used (in Swift 2 please). Thank you

推荐答案

请参阅按位操作的维基百科页面和 Swift文档对于按位运算符.

See the Wikipedia page on Bitwise Operation and the Swift documentation for bitwise operators.

这些是按位运算符. &是按位AND，而|是按位OR.

These are bitwise operators. & is bitwise AND and | is bitwise OR.

请参阅以下示例:

    0011 (decimal 3)
AND 0010 (decimal 2)
  = 0010 (decimal 2)

   0101 (decimal 5)
OR 0011 (decimal 3)
 = 0111 (decimal 7)

来源:维基百科

以前在StackOverflow上已经讨论了按位运算符的用法:

The uses of bitwise operators have been discussed before on StackOverflow:

• 按位运算的实际应用
• 使用按位运算

• practical applications of bitwise operations
• Using bitwise operations

使用按位异或(不是您的问题，但仍然是一个很酷的逻辑门)引起了我的注意(@ Vilx- 在这里)(我不知道它是如何工作的，但是答案被接受并投票了34次)

A use of bitwise XOR (not in your question, but a cool logic gate anyway) that caught my eye (by @Vilx- here) (I don't know how it works, but the answer was accepted and up-voted 34 times)

编辑:如果您想知道它是如何工作的，可以在

If you want to know how it works, there's a nice simple proof over on XOR swap algorithm - Wikipedia

交换两个没有中间变量的整数变量:

Swapping two integer variables without an intermediary variable:

A = A^B // A is now XOR of A and B
B = A^B // B is now the original A
A = A^B // A is now the original B

如果这些操作无济于事，则我已在本文中链接至两次的Wikipedia页面具有应用程序部分，但它们实际上并不适用于高级语言(除非出于某些原因，您希望优化算术以仅使用按位运算).

If these don't help, the Wikipedia page I already linked to twice in this post has an Applications section, but they don't really apply to higher-level languages (unless for some reason you want to optimize your arithmetic to use only bitwise operations).

这篇关于&是什么和|运营商吗?它们与&&有何不同?和||?迅速的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！