I want the function, which is a little tool, a line of code I can include in my own programs and generally those tools live in sections two or three of the manual.

我想要一个函数，那是一个小工具，在我程序中可以包含的一行代码,通常这些工具在手册的第二节,或第三节。

哈佛公开课 - 计算机科学课程节选

So when you define a function, you have, as we've seen these curly braces, that define all ; of the code that's associated with that function; open curly brace code, close curly brace, that is the function.

当你定义一个函数，就像我们看到的这些花括号，定义了与,那个函数相关的所有代码;,左花括号，代码，右花括号，这就是一个函数。

哈佛公开课 - 计算机科学课程节选

to do sqrt, or square root-- no, I'm going to square root use sqrt, that's the name I'm using here-- square root a hundred different places in some piece of code. Without function, I'd have to copy that piece of code everywhere.

让我做一下准备,想象一下我要调用sqrt或者-,不，我会调用sqrt函数,这是我在这里用的名字，我得把这段代码到处复制。

麻省理工公开课 - 计算机科学及编程导论课程节选

And, in fact, it kind of looks like a function, and yet here's a semicolon I just said that can get you into trouble, and yet that's not actually a function, because there's no interesting lines of code, because it turns out the interesting code is down here at the bottom.

实际上，它有点像一个函数，并且这里有一个能够使你陷入麻烦当中的分号,那个事实上也不是一个函数，因为这里没有有用的代码，因为,有用的代码都在底端。

哈佛公开课 - 计算机科学课程节选

So let's actually see how we solve this with this function with actual code.

然我们看看怎样用,这个函数和代码解决这个问题。

哈佛公开课 - 计算机科学课程节选

The standard library, that first line of code, it's not strictly necessary but any time you use a function, a tool that someone else wrote that lives in that so called library, you do need that include line as we'll see.

标准库函数--第一行代码，严格来说，不是每次都要写的，但是一旦你调用某个别人写，的函数，而这个函数又恰巧位于标准库里面,你就要像我们看到的这样，把它include进去。

哈佛公开课 - 计算机科学课程节选