Same way that I have multiplication or division as a primitive, functions are going to give me, or somebody else who wrote them for me as part of a library, a new primitive that I'm going to be able to use.

我在用乘法或者除法当做原语,这些函数,或者别人写程序库中的函数,将会给我返回一个,我能使用的新原语。

麻省理工公开课 - 计算机科学及编程导论课程节选

There's been a lot of work done on these over the years, but in fact, it's pretty hard to invent a good hash function. So my advice to you is, if you want to use something was a hash, go to a library. Look up a good hash function.

已经做过了很多的尝试和努力,但是事实是，很难发明出一个好的哈希函数,所以我给你们的建议是,如果你们想使用哈希功能,到函数库中查找一个好的哈希函数。

麻省理工公开课 - 计算机科学及编程导论课程节选

At the top, I've got some CS50 Library going on, argv standard I/O library; I don't bother mentioning argc or argv because I'm not going to use them in this program.

在顶端，我使用了CS50函数库，标准输入输出库，我没有提到argc或者,因为我不会在这个程序中使用它们。

哈佛公开课 - 计算机科学课程节选

But long story short, if I want to use a function called sleep, -- the reason I, the programmer, knew to use that library -- -- that header at the top -- because it told me to in this little synopsis.

但长话短说，如果我想要用一个叫做sleep的功能，我作为程序员知道使用那个函数库-,上面的标题-,因为在这个小的大纲中它告诉我。

哈佛公开课 - 计算机科学课程节选

It's defined in CS50's library; its sole purpose in life is to ask the user for a floating point value and return it.

它被定义在CS50的函数库中，它的唯一目的是,向用户询问一个浮点数的值，然后返回它。

哈佛公开课 - 计算机科学课程节选

So I could -- and the hint here is that looks like you probably do want to use CS50's library because I've included the so-called header file for it.

所以我可以--这里的提示看起来好像,你可能的确想使用CS50的函数库,因为我包含了所谓的头文件。

哈佛公开课 - 计算机科学课程节选

include stdio h The next line of code says include standard io.h which just as a little sanity check contains among other things, printf.

接着的一行代码写着,这个库文件包含一些我们常用的函数,譬如，printf函数。

哈佛公开课 - 计算机科学课程节选

No. So we deliberately, in CS50's library, named these functions consistent with their behavior.

不行，所以我们故意在CS50的函数库中，根据函数的作用来给他们命名。

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

And if you don't include it, GCC, the compiler will yell at you.

如果你没有include这个库函数，GCC的时候，编译器就会报错。

哈佛公开课 - 计算机科学课程节选

Well, remember from Wednesday we introduced CS50's library.

好的，请记住从周三开始我们介绍了CS50的函数库。

哈佛公开课 - 计算机科学课程节选

GetInt So next I cull the CS50 function called GetInt.

所以接下来我挑选CS50函数库中的函数。

哈佛公开课 - 计算机科学课程节选

We put it there via the CS50 library.

我们把它放在CS50，函数库中。

哈佛公开课 - 计算机科学课程节选