“一些”和“一些”之间的区别是什么。 ==“some\0”和c ++中的strcmp（“some”，“some\0”）？ [英] what is the difference between "some" == "some\0" and strcmp("some","some\0") in c++?

问题描述

some==some\0和 strcmp（some，some\0 c>

为什么 if（some==some\0 code>返回 false 和 if（！strcmp（some，some\0））返回 true ？

推荐答案

当你执行 if some==some\0）你正在比较的地址。它被转换为 if（0xdeadbeef == 0x0badcafe）这显然是false。

When you're doing if("some" == "some\0") you are comparing the addresses. It is translated into if (0xdeadbeef == 0x0badcafe) which is obviously false.

$ c> strcmp ，您可以比较每个框的内容，直到到达每个框中的 \0 。

When you use strcmp, you compare the content of each box until you reach \0 in each of them. That's why the second test returns true.

如果您将第一个测试更改为 if（some==some）然后编译器可能潜在地看到它们是相同的字符串，并且将只存储它们一次。这意味着你的测试将转换为 if（0x0badcafe == 0x0badcafe）这显然是真的。

If you change the first test to if("some" == "some") then a compiler may potentially see that they are the same strings and will store them only once. Which means that your test will transform into if (0x0badcafe == 0x0badcafe) which is obviously true.

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