Probably simple bitwise shifting question

问题

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)

回答1:

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

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

That is,

temp2 = temp & 0xff;  // or 255

来源：https://stackoverflow.com/questions/56610742/probably-simple-bitwise-shifting-question