当你的逻辑不是浮动会发生什么？

问题描述

我以为这只是返回一个int。还有什么事情我应该知道的？ C / C ++区别在哪里？

 浮动= 2.5;
！一个; //这是什么回报？诠释？浮动？
 

解决方案

对于C ++，引用C ++ 11§5.3.1/ 9：

So what's really relevant here is the behavior of static_cast<bool>(some_float) – quoting §4.12/1:

Putting those together, 2.5f is a non-zero value and will consequently evaluate to true, which when negated will evaluate to false. I.e., !a == false.

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Regarding C, quoting C99 §6.5.3.3/5:

I.e. the net result is the same as with C++, excepting the type.

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