C中的移位运算符(<<、>>)是算术还是逻辑? [英] Are the shift operators (<<, >>) arithmetic or logical in C?

问题描述

在 C 中，移位运算符 (<<, >>>) 是算术还是逻辑?

In C, are the shift operators (<<, >>) arithmetic or logical?

推荐答案

根据 K&R 第 2 版 结果取决于有符号值右移的实现.

According to K&R 2nd edition the results are implementation-dependent for right shifts of signed values.

维基百科说 C/C++通常"对有符号值实现算术移位.

Wikipedia says that C/C++ 'usually' implements an arithmetic shift on signed values.

基本上，您需要测试编译器或不依赖它.我对当前 MS C++ 编译器的 VS2008 帮助说他们的编译器进行了算术移位.

Basically you need to either test your compiler or not rely on it. My VS2008 help for the current MS C++ compiler says that their compiler does an arithmetic shift.

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