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And this is because as you start writing--saving files to your hard drive, what happens is you might save this file here, then this one, then this one, then this one, but very reasonably you might go back eventually and delete this one.
这是因为当你开始对硬盘驱动器进行读写时,你可以保存一个文件到磁盘的某处，然后再一个，再一个，又一个，最后你可能回到这,并删除这一个文件。
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RAM You probably know your computer has something called RAM which is where documents and programs live just temporarily while you're running them 'cause RAM tends to be pretty fast and whereas your hard disk is where programs and files live permanently.
也许你知道电脑有一个,正在使用的程序和文件都暂时存放在那里,而且会加快电脑速度,而硬盘是程序和文件,永久存储的地方。
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What we are seeing here is a big transition from just experiment and documentation to modern chemistry.
我们见证了一个很大的过度,从只是实验和,文件材料到现代化学。
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This is a little file I created, all right, and I'm going to start with a sequence of these things and walk them along, again I invite you to put comments on that handout so that you can follow what we're going to do. All right?
这是我创建的一个小文件，好，然后我回去以一系列这样的事情,开始然后进行下去，我还是想大家都在手册上做一些注释,这样我们就能对将要做的事情,做一个记录了，对不对？
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It has to have a contract design; that would be a document, which is a contract between the insured and the insurance company.
它必须有合同设计,那是一个文件,也就是被保险人和保险公司签订的合同
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She jumped up and jumped back and started moving papers around and really was giving me this look ?" like "Why don't you just leave?"
她猛地站起来，往后退了一步,赶紧拾掇着桌面上的文件,给了我一个眼神,好像在说“为什么还不滚“
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- Parses through them, which means to read through this-- what are really just text files, top to bottom, left to right.
从语法上分析它们，这就是说要阅读它-,实际上是一个文本文件，从上到下，从左到右。
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For some reason, at the top of this file, I've also included what I've called a function prototype.
因为一些原因，在这个文件顶端，我包含了一个函数原型。
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So as the particles on the disk that get the current in the read/write head moving put together millions of these magnetized segments and you've got a file.
通过读写头你就可以得到每个粒子的极性,如果把这些上百万粒子的信息,汇聚要一起就够成了一个文件。
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When you're working on a file, it's saving constantly to RAM but also hopefully to disc, the hard disk so you don't actually lose it if the power goes off.
当你打开一个文件，它不断地保存在内存中,但对于光盘，硬盘,当你断开电源的时候，数据不会丢失。
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You write the source code, the stuff that looks like this and then you save your file, and now you just have a text file.
比如你们写出像这样的源代码后,保存，你将会得到一个文本文件。
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> David: An error message of some sort like "file not found" or "commands not found."
>，大卫：会出现一个错误信息像“没找到文件“,或“没找到命令“
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So among your printouts are a couple of files one called condition1.c. I'm going to change over to my terminal window.
在你们的打印输出中有几个文件,其中一个叫做condition1，c，我将,改变我的终端窗口。
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Right now, you've got to write it in one file.
现在，你可以把它写在一个文件里。
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Right now, this is just a text file. OK.
好，这就是一个文本文件，好。
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The bits are still there, much like bits are still left when you erase a file on your hard disk but they're forgotten about.
二进制数还在那里，就像你在硬盘上删除一个文件,二进制还在那里,但是它们被遗忘了。
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As I said, right now that's just text file.
正想我刚才说的，它现在就是一个文本文件。
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Turns out they make stock data and the like available essentially via text files or via a simple API application programming interface which will be one of the themes of the course.
他们基本上是通过使用文本文件,或者通过一个简单的API应用,或者编程接口来获取股票和其他一些数据,这些都是本课程的主要内容。
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It's in a file called swap.C. Everything should be alphabetical so it should be toward the end of this week's packet and notice that it's almost identical except for a couple of syntax changes.
在一个叫做swap。c的文件中，对于这周末的数据包来说,所有的东西都是字母,请注意,除了几个语法改变,它几乎是一样的。
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But once you've written a program, "hello world," in a file called hello.c, you Save and Quit.
不过一旦你们写了一个“hello，world“程序“,并且把它保存为hello，c文件后退出。
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Just the .h file as we'll see is obviously named different than a .c file.
这些头文件是以，h为后缀的，完全不同于,一个，c文件。
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This is a file called Holloway.c. This is-- to be clear, not a program.
这里有一个文件Holloway，c，不是程序-,我们马上就要清除掉它。
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Let's go into hi3.c. So again I have some comments up top.
再创建一个文件hi3，c，还是一样，头部有一些注释信息。
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So it turns out a really nice shortcut on most systems, oops, is to say if you have a file called hello.c and you wanna turn it into a program called hello, well, make hello just write in the command makeHello and it will do all of that for you automatically and hand you a program called hello.
就是寻找一种能在大多数系统上运行的更快捷的方式，哇！,也就是说，你有一个hello，c的文件,你想把它变成一个名为hello的程序，那么只需要敲入命令,它就会自动为你生成,一个hello程序。
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LS And what very often happens if you do an LS in your account, to list your files, there's a whole lot of stuff in here at the moment -- and I don't have it here - but what you'll often see -- I'll just fake this demo -- is a file called core.
经常发生的是，如果你用你的账号做一个，来列出你的文件，此刻这里有一大堆元素,-它不在这里,但你们将经常看到--我将篡改这个演示-,是一个叫做core的文件。
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There is file now called nonswitch.c among your printouts.
这个有一个叫做nonswitch，c的文件,在你们的打印资料里。
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Why is this much nice? Well, that's a handy piece of code. Because imagine I've got that now, and I can now store that away in some file name, input dot p y, and import into every one of my procedure functions, pardon me, my files of procedures, because it's a standard way of now giving me the input.
为什么这样很好呢？,这是一段很好用的代码,因为想象下如果我有了这段代码,我能把它用某个文件名保存起来,后缀是。py，导入到所有的处理函数中,抱歉，我的处理文件,因为这是一个标准的输入方法。
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Well, I include what's called a header file as we'll call it.
好吧，我需要包含一个头文件。
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include cs50 h But this says include and this says include a file called cs50.h that lives in some special place on the server that the cs50 staff wrote.
这里写在,众所周知，cs50，h是由CS50的员工,编写的一个库文件。
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Make then assumes I'm in a file called make math2.c and goes and finds it.
假设我在一个叫做“make，math2，c“的文件里,然后去找它。
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