如何将位从一个变量复制到另一个？ [英] How to copy bits from one variable to another?

问题描述

假设我有 int 变量 v1 ：

  1100 1010 
  

c> int v2 ：

  1001 1110 
  / pre> 
 
 
我需要将 v2 的最后四位复制到 v1 ，以便结果是：
  1100 1110 
 ^ ^位v2 
 | 
 |前4位v1 
  
我如何在C或C ++中做这件事？我读了几篇关于逐位操作的文章，但是我找不到任何具体的信息。
解决方案
 
  v1 =（v1&〜0xf）| （v2& 0xf）; 
  
您从阅读的文章中发现了不明白的地方吗？
 
Let's say I have this int variable v1:
1100 1010
And this variable int v2:
1001 1110
I need to copy the last four bits from v2 to the last four bits of v1 so that the result is:
1100 1110
^    ^ last four bits of v2
|
| first four bits of v1
How would I got about doing this in C or C++? I read a few articles about bitwise operations but I couldn't find any information specifically about this.
解决方案
Bitwise operations were the right things to look for.
v1 = (v1 & ~0xf) | (v2 & 0xf);
Is there something specific you didn't understand from the articles you read?

                        
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