Let me generalize this. In this case, my incrementer was just adding 1 to an integer, it's a pretty straightforward thing to do.

当我完成后，我不会再显示任何信息了，好，好，那么你们已经看过两个简单的例子了，让我来讲讲概念，在这个例子中。

麻省理工公开课 - 计算机科学及编程导论课程节选

And when I'm done with the whole thing, before I end the increment of the variable, you know, when I'm done, I'm just not returning anything out.

在循环外面初始化它，然后做一个终结测试，然后在循环内部有一个指令集，在这个例子中，就是对余数做检查，然后显示信息，当我完成了整个循环。

麻省理工公开课 - 计算机科学及编程导论课程节选

You go to ABI Inform, which is one of the things that Yale subscribes to, on your laptop and it puts you right into the text of The Wall Street Journal.

BI/INFORM世界著名的商业经济管理期刊全文图像数据库,那是耶鲁所订阅的信息来源,它会在电脑上直接以文本形式显示,《华尔街日报》的内容

耶鲁公开课 - 金融市场课程节选

It means anybody using that little function get float doesn't have to worry about what's inside of it. So for example, I decide I want to change the message I print out, I don't have to change the function, I just pass in a different parameter.

这代表着用这个方法去获得浮点数,的任何人都不用担心具体的实现了,例如，如果我想改变下,显示的信息的话，我不必去改变方法，我传个不同的参数就可以了。

麻省理工公开课 - 计算机科学及编程导论课程节选

But notice what this does. The first thing it does is, it says, let's check and make sure x is greater than or equal to 0. If it isn't, notice what's going to happen. None of that block is going to get executed, and it's going to come down here and print out a useful piece of information, which says, hey, you gave me a negative number. I don't know how to do this.

做的是和以前一样的事情,但是注释它做了什么，第一件做的事情就是,程序说，要去检查并且确信x是大于等于0的，如果不是的话，请注意会发生什么,下面的代码都不会被执行,程序会到这里来然后显示一些有用的信息,信息会说，嘿，你给了我一个负数,我不知道该怎么弄这个了。

麻省理工公开课 - 计算机科学及编程导论课程节选