如何添加一点半字节 [英] How to add a bit with nibble

问题描述

Hi
我想在半字节中添加一个比特，因为我想通过在每个数据块中添加一个额外的比特将8比特数据分段为2个4比特半字节，并且在接收端执行将接收数据5位的形式，之后将删除额外的位和Assemble 2半字节的

Hi I want to add a single bit in the nibble as i want to fragment 8 bits data into 2 4 bit nibble's by adding an extra bit to each of them and do on the reception side will receive data in the form of 5 bit, after that will remove the extra bit and Assemble 2 nibble's

推荐答案

首先，创建一个第N位设置的数字，所有其他位清除。该值 1<< N 。

下一步，取出原始值并使用上一步的值计算按位OR。

即：

First, create a number with N-th bit set and all other bits clear. This value is 1 << N.
On next step, take your original value and calculate the bitwise OR with the value from the previous step.
That is:

int N = //... bit number
int value = //... can be any integer type, signed or unsigned
value |= 1 << N; // same as:
value = value | (1 << N)

清除一下，使用按位AND和补码：

To clear a bit, use bitwise AND with the complement:

value &= ~(1 << N);

这就是全部。学习按位运算符： http://www.learncpp.com/cpp-tutorial/38-bitwise-operators [ ^ ]。< br $>

-SA

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