可能简单的按位移位问题 [英] Probably simple bitwise shifting question

问题描述

unsigned short int temp, temp2;

temp = 0xbc61; // 1011110001100001
// temp2 has to be 0x61 (01100001) but I don't know how to shift, mask or whatever
temp2 = (temp << 8); // this doesnt work, because I get 0x6100 (110000100000000)

推荐答案

要选择1011110001100001的最低8位，您需要对11111111执行按位与运算:

To select the 8 lowest bits of 1011110001100001, you need to perform a bitwise AND operation with 11111111:

  1011110001100001
& 0000000011111111
------------------
  0000000001100001

也就是说，

temp2 = temp & 0xff;  // or 255

这篇关于可能简单的按位移位问题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！