Bit Manipulation（p660）

Bitwise Operators

一个数

~x NOT - 自己所有位取反

两个数

x&y AND - the operator returns a value whose bits are turned on only if both original bits are turned on.

x|y OR - if either of the original bits are turned on.

^ XOR - exactly one of the original bits are turned on.

Shift Operators

sign bit might change
>>>
<<

sign bit doesn’t change
>>