子程序和函数有什么区别？ [英] What is the difference between a subroutine and a function?

问题描述

可能重复：

功能和程序之间的区别是什么？

我在网上搜索了这个问题的答案，我得到的答案是一个函数可以返回一个值，修改一个值等，但是一个子例程不能。但是我对这个解释并不满意，在我看来，这种差异应该不仅仅是一个术语问题。

所以我正在寻找一个更概念的问题答案。

解决方案

一个函数反映函数的数学定义，该函数是从一个或多个输入到一个值的映射。 > 1

子程序是任何具有确定入口点和退出点的代码块的通用术语。

但是，这些术语的确切含义会因上下文而异。

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1 。显然，这不是函数的正式数学定义。

Possible Duplicate:
What is the difference between a ‘function’ and a ‘procedure’?

I searched online for an answer to this question, and the answer I got was that a function can return a value, modify a value, etc., but a subroutine cannot. But I am not satisfied with this explanation and it seems to me that the difference ought to be more than just a matter of terminology.

So I am looking for a more conceptual answer to the question.

解决方案

A function mirrors the mathematical definition of a function, which is a mapping from 1 or more inputs to a value.¹

A subroutine is a general-purpose term for any chunk of code that has a definite entry point and exit point.

However, the precise meaning of these terms will vary from context to context.

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_{1. Obviously, this is not the formal mathematical definition of a function.}

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