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位运算(右移) <<的疑问

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悬赏园豆:5 [已解决问题] 解决于 2018-02-07 12:10
/*
对一个二进制位移,一般什么场景让位移功能存在?
右移有正负数字判断,对二进制数还有正负? 难道-0010?

给个右移的直观教程,动画is wonderful...

谢了。
*/
问题补充:

符号知道了,   1000 0010  (负数)  0000 1001 (正数)

Coca-code的主页 Coca-code | 初学一级 | 园豆:10
提问于:2018-02-07 10:28
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最佳答案
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dudu | 高人七级 |园豆:29762 | 2018-02-07 11:27

谢了,了解一下。。

Coca-code | 园豆:10 (初学一级) | 2018-02-07 12:11
其他回答(1)
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比如 int 转 byte之类的。

当然也可以直接运算,比如对于整形来说左移1大约就是*2,右移1大约就是/2。

例如参见BinaryWriter(下面的函数是扩展了,去掉Big就是原有的,它里面的实现就有移位):

protected override void OnWriteToBuffer(BinaryWriter writer)
{
writer.WriterBig(Length);
writer.WriterBig(Number);
writer.WriterBig((ushort)Catelog);
writer.WriterBig(SessionId);
writer.WriterBig(Version.Buffer);
writer.WriterBig((byte)EncryptOpition);
writer.WriterBig(KeyForCommonEncript);
}

花飘水流兮 | 园豆:13617 (专家六级) | 2018-02-07 11:41

谢了,

我是想:大多数算法,都是对10进制数字的操作, 利用二进制5种运算特性,或许可以给算法开辟另一番蓝海。。

支持(0) 反对(0) Coca-code | 园豆:10 (初学一级) | 2018-02-07 12:10

@Coca-code: 呵呵。有想象力很好,你那么有兴趣应该好好看看计算机原理,看看布尔数学。

支持(0) 反对(0) 花飘水流兮 | 园豆:13617 (专家六级) | 2018-02-07 12:51

@花飘水流兮: 恩师

支持(0) 反对(0) Coca-code | 园豆:10 (初学一级) | 2018-02-07 13:00
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支持(0) 反对(0) 大da脸 | 园豆:73 (初学一级) | 2018-02-08 10:11
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