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[Tutorial 04] 关于「& 0xFF」的问题 #226

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Haceau-Zoac opened this issue Jul 4, 2022 · 1 comment

Haceau-Zoac commented Jul 4, 2022

3. UTF-8 编码处，代码里有 (u >> 12) & 0xFF，0xFF = 11111111，对它进行逻辑与操作和不进行不一样吗？

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zjb1001 commented Jan 2, 2024

不等价，0xFF保证获取最低八位
以u(24bit)为例，u >> 12后，u还剩下12bit，而(u >> 12) & 0xFF 只有低8bit

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