“！= true"之间的区别和"== false"? [英] Difference between "!= true" and "== false"?

问题描述

在编程语言中，比较！= true"和"== false"之间是否存在技术/逻辑差异，如果存在，应在什么情况下选择哪个比较?

Are there any technical/logical differences between the comparison "!= true" and "== false" in programming languages, and if there are, which comparison should be chosen on what occasion?

推荐答案

逻辑上，根据所比较的值的类型和所使用的语言，可能会有差异.例如:

Logically there can be differences depending on the type of value that you are comparing and language you are using. For example:

x == false表示x != true，但x != true并不总是表示x == false，因为x也可以是一些无意义的值.

x == false implies x != true, but x != true does not always imply x == false because x can also be some nonsense value.

1 + 1 = 3都是== false和!= true.

7 > cat都不是== false和!= true，因为它是无意义的.

7 > cat is neither == false and != true since it is nonsense.

x = null是!= true，但不是== false.

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