在在C字符访问位 [英] Access bits in a char in C

问题描述

我有一个十六进制数0x37符号和二进制再presentation是0011 0111我如何访问二进制重新presentation这是11的第2位？我如何使用位移位或屏蔽来实现这一目标？我可以通过位访问位，但在人们不两位去了？

I have a hex number 0x37 and its binary representation is 0011 0111. How do I access the first 2 bits of the binary representation which is "11"? How do I use bit shifting or masking to achieve this? I can access bit by bit but not two bits at one go?

推荐答案

如果您＆放大器; 与×03你的号码，你会得到最后两位。

If you & your number with 0x03, you will get the last two bits.

char c = 0x37;
char mask = 0x03;
char lastTwo = c & mask;

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