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Absolute Beginner s Guide to Bit Shifting?
任何人都可以向我解释运算符<<；或者>>；
<<和>>运算符是位移位运算符。x<；<；1将x中的所有位移位到下一个最高有效位，有效地乘以2。更一般地，x<<；n＜/code＞将比特向上移位n个位置。要了解此操作的工作原理，最简单的方法是查看二进制表示：
3 0000011 = 3
3 << 1 0000110 = 6
3 << 2 0001100 = 12
3 << 3 0011000 = 24
类似地，>>运算符向下移位位：
58 0111010 = 58
58 >> 1 0011101 = 29
58 >> 2 0001110 = 14
58 >> 3 0000111 = 7
58 >> 4 0000011 = 3
58 >> 5 0000001 = 1
58 >> 6 0000000 = 0
3，二进制，是＜code＞11＜/code＞，向左移动一位是＜code>110＜/code>，或十进制为6。
想想a<<；b作为a*（2**b）
>>用于右移。想想a>>；b作为a//（2**b）
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