位运算是将一个数的二进制进行计算
- “位与”运算（&）
使用2个数的二进制进行运算，当相同位数都是1时，结果位才为1 ，否则是0
例如：12&8=8
- “位或”运算（|）
使用2个数的二进制进行运算，当相同位数都是0时，结果位才为0，否则是1。
例如：4|8=12
- “位异或”运算（^）
使用2个数的二进制进行运算，当相同位数都是0或者同时为1时，结果位才为0，否则是1。
例如：15^6=9
- “位取反”运算（~）
某个二进制数的位数取反，位数为1，取反则0；位数为0，取反则1.
例如：1001取反=0110
- “左移位”运算（<<）
左移位的运算符”>>”
将一个二进制数向左移动指定的位数，左边（高位端）溢出的位被丢弃，右边（低位端）的空位用0补充。
例如：2<<2=8
左移位运算相当于乘以2的N次幂
- 右移位
右移位的运算符”>>”
将一个二进制数向右移动指定的位数，右边（低位端）溢出的位被丢弃，左边（高位端）的空位端，如果高位端为0，则是正数，空位补0，如果高位为1为负数，空位补1。
右移位运算相当于除以2的N次幂
- 运算符的优先级
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