Unverified Commit 673cb276 authored by 心旷神怡's avatar 心旷神怡 Committed by GitHub
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Update bit.md

parent 4a5d8ae9

docs/math/bit.md

+23 −3
Original line number Diff line number Diff line
@@ -20,7 +20,15 @@ 


> 举例：

>

> $\begin{aligned} &5&=&&(101)_2\ &6&=&&(110)_2\ &5\tt,&,6\rm&=&&(100)_2&=\ 4\ &5\tt,|,\rm6&=&&(111)_2&=\ 7\ &5\tt,\text{^},\rm6&=&&(011)_2&=\ 3\ \end{aligned}$

> $$

> \begin{aligned}

> &5&=&&(101)_2\\

> &6&=&&(110)_2\\

> &5\tt\,\&\,6\rm&=&&(100)_2&=\ 4\\

> &5\tt\,|\,\rm6&=&&(111)_2&=\ 7\\

> &5\tt\,\text{^}\,\rm6&=&&(011)_2&=\ 3\\

> \end{aligned}

> $$



#### 取反
@@ -32,7 +40,13 @@ 


> 举例：

>

> $\begin{aligned} 5=(0000\ 0101)_2\ 5\ \text{的补码} =(1111\ 1010)_2\ \tt\ \text{~}\rm5=(1111\ 1010)_2 \end{aligned}$

> $$

> \begin{aligned}

> 5=(0000\ 0101)_2\\

> 5\ \text{的补码} =(1111\ 1010)_2\\

> \tt\ \text{~}\rm5=(1111\ 1010)_2

> \end{aligned}

> $$



## 左移和右移
@@ -48,7 +62,13 @@ 
>

> 举例：

>

> $\begin{aligned} &5&&=&&(101)_2\ &5\tt,<<,\rm2&&=&&(10100)_2!!!&=&&!!!20\ &5\tt>>\rm1&&=&&(10)_2&=&&2 \end{aligned}$

> $$

> \begin{aligned}

> &5&&=&&(101)_2\\

> &5\tt\,<<\,\rm2&&=&&(10100)_2\!\!\!&=&&\!\!\!20\\

> &5\tt>>\rm1&&=&&(10)_2&=&&2

> \end{aligned}

> $$



如上图，右移操作中末尾多余的 “1” 将会被舍弃。