所有的编程语言都对 NIL、null 或 undefined 有明确的概念吗? [英] Do all programming languages have a clear concept of NIL, null, or undefined?

问题描述

我正在用许多不同的语言编写一个键值存储 API(如 ODBC，只是接口，而不是底层存储)，虽然我不想在语言之间音译 API，但我不想例如存储一个Java 中的值作为空"，然后用另一种不支持空概念的语言读取它.我不确定我是否解释得这么好，但这是我的第一次尝试:)

I am writing a key value store API (like ODBC, just the interface, not the underlying store) in many different languages and while I do not want to transliterate the API between languages, I do not want for example to store a value from Java as a "null" and then read it in another language which does not support a concept of null. I'm not sure if I am explaining this so well, but its my first try :)

见:

这个 API 是不是太简单了?

关于key-value store API的讨论

for the discussion about the key-value store API

推荐答案

没有.我能想到的所有没有指针的程序化语言都没有这样的概念.例如，经典的 Basic(如 80 年代家用电脑中使用的那种)就没有这样的概念.我认为 Cobol 也没有.

No. All prodedural languages without pointers I can think of have no such concept. For example, classical Basic (like the one used in 80s' home computers) has no such concept. I don't think that Cobol has it, either.

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