移位的奇怪行为 [英] Strange behavior of bit-shift

问题描述

无法理解这种移位的行为:

Can't understand behavior of this bit shift:

int container = 1;

cout<<(container>>32)<<endl;

如果是逻辑移位，则输出应为0，但应为1，就像循环移位一样.在查看反汇编时，我看到所使用的命令是SAR.请向我解释这种行为.

If it's logical shift the output should be 0, but it's 1 instead, as if it was cyclic shift. When looking at disassembly I see that command used is SAR. Please explain this behavior to me.

推荐答案

您将32位数字移位了32，这导致行为未定义，结果1是一个巧合.

You shifted a 32-bit number by 32, which results in undefined behavior, and the resulting 1 is a coincidence.

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