不同语言的因子算法(Factorial Algorithms in different languages)

我想看到你可以想出的所有不同的方法，一个阶乘子例程或程序。 希望任何人都可以来这里，看看他们是否想要学习一种新的语言。

思路：

程序 实用 面向对象 一个衬垫 混淆 古怪 坏代码 多语种

基本上我想看一个例子，写一个算法的不同方法，以及它们在不同语言中的外观。

请将其限制为每个条目的一个示例。 我会允许你每个答案有不止一个例子，如果你想突出一个特定的风格，语言，或只是一个思想深思熟虑在一个职位。

唯一真正的要求是必须找到给定参数的阶乘，以所有语言代表。

创意！

推荐指南：

# Language Name: Optional Style type - Optional bullet points Code Goes Here Other informational text goes here

Ideas:

Procedural Functional Object Oriented One liners Obfuscated Oddball Bad Code Polyglot

Basically I want to see an example, of different ways of writing an algorithm, and what they would look like in different languages.

Please limit it to one example per entry. I will allow you to have more than one example per answer, if you are trying to highlight a specific style, language, or just a well thought out idea that lends itself to being in one post.

The only real requirement is it must find the factorial of a given argument, in all languages represented.

Be Creative!

Recommended Guideline:

# Language Name: Optional Style type - Optional bullet points Code Goes Here Other informational text goes here

I will ocasionally go along and edit any answer that does not have decent formatting.