& quot;！= true& quot之间的差异和& quot ==假& quot ;? [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

逻辑上可能存在差异，具体取决于您比较的值类型和使用的语言.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 暗示 x！= true ，但是 x！= true 并不总是暗示 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 ，因为这是胡说八道.

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

x = null 是！= true ，但不是 == false .

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