TRUE 是否始终具有非零值? [英] Has TRUE always had a non-zero value?

问题描述

我有一位同事坚持认为 TRUE 曾经被定义为 0，而所有其他值都是 FALSE.我可以发誓我使用过的每一种语言，如果你甚至可以得到一个布尔值，那么 FALSE 的值是 0.TRUE 曾经是 0 吗?如果是这样，我们什么时候切换的?

I have a co-worker that maintains that TRUE used to be defined as 0 and all other values were FALSE. I could swear that every language I've worked with, if you could even get a value for a boolean, that the value for FALSE is 0. Did TRUE used to be 0? If so, when did we switch?

推荐答案

你的同事对 0/non-0 感到困惑的事情可能是指人们使用数值作为返回值来表示成功，而不是真相(即在 bash脚本和一些 C/C++ 风格).

The 0 / non-0 thing your coworker is confused about is probably referring to when people use numeric values as return value indicating success, not truth (i.e. in bash scripts and some styles of C/C++).

使用 0 = 成功可以更精确地指定失败原因(例如 1 = 丢失文件，2 = 丢失肢体，等等).

Using 0 = success allows for a much greater precision in specifying causes of failure (e.g. 1 = missing file, 2 = missing limb, and so on).

附带说明:在 Ruby 中，唯一的 false 值是 nil 和 false.0 是正确的，但与其他数字不同.0 为真，因为它是对象 0 的一个实例.

As a side note: in Ruby, the only false values are nil and false. 0 is true, but not as opposed to other numbers. 0 is true because it's an instance of the object 0.

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