And it takes the set of stocks to simulate, a fig, figure number, this is going to print a bunch of graphs, and I want to say what graph it is, fig mo and whether or not I believe in big mo.

我们需要一些股票才能进行模拟，很多很多的股票，我们会打印一些图，然后我会告诉你们这些图是什么意思，或者我们看到这个。

麻省理工公开课 - 计算机科学及编程导论课程节选

I go ahead and print out a small number.

我继续打印一个小数字。

哈佛公开课 - 计算机科学课程节选

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

So we looked at a number of fairly small programs that at the end of the day did very little more than print hello world and the like.

这堂课最后,如果我们只是看几个小程序，根本没啥用,还不如hello，world程序呢。

哈佛公开课 - 计算机科学课程节选