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So I'm going to comment those out, and let's go down to this piece of code, and uncomment it.
那么我会把这些注释上，让我们看看这段代码，取消注释。
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I'm not going to do it for you, but what would I think about doing when I change the code?
要改变代码应该做什么呢？,我不会帮你们做这些,但是我在改编代码的时候会想什么呢？
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And notice because I have just one line of code inside of each of these branches, what have I clearly omitted?
请注意因为我在每个分支中只有一行代码,显然地我省略了什么？
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I will be posting code that you can play with, and I suggest you go through exactly this kind of exercise.
我给你一些你用的上的代码，我建议你们,多进行一些这种实验。
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I've written a little for loop, which is going to iterate over all of the elements in the list.
让我们先看看这儿的代码，我已经写了一个循环语句,用来迭代处理数组中所有的元素。
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I'm going to start somewhere near the middle of the code. Again, a lot of times, people don't do that.
我会在代码中间的某个位置开始,再说一次，很多时候人们不会这么做。
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What happens now after we've executed this third line of code, what happens next in the story?
我执行完第三行代码会发生什么呢,在这之后会发生什么呢？
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All right, those pieces of code inherently involved something that does depend on the size of the input, or on the particular input.
好，这些代码,肯定会涉及到一些,与输入的大小相关的东西，或者说与特定输入相关。
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And we will show you exactly how you can write programs that actually interact with the user in that way.
我们将给大家示范如何,书写代码以及跟用户交互。
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The other thing you want to do is find the part of the program that is most likely at fault.
你们要做的另外一件事就是找出,最可能出错的那一部分代码。
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What we will distribute for most lectures is a handout that's mostly code examples that we're going to do.
我们在大多课堂上会散发一些,印着我们要做的,代码范例的资料。
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I was being a little lazy on Wednesday in the interest of simplifying the code as much as possible.
在周三我在那个网站上尽可能地,简化代码的时候，我有点偷懒。
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All right, you can see that this little piece of code, it's got a loop in there, and what's it doing?
好，你们看到的这一小块代码,是做了一个循环吧？,他在做什么？
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Right. If you look at the rest of that code, gee, it looks a lot like what I had elsewhere.
好了如果你看看剩下的代码，天呐，看上去就像我在别的地方写过的。
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You will be able to infer from some of our code how in fact you can implement some more sophisticated programs.
你可以从一些代码中推断出,应该要怎样实现一些较复杂的程序。
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And they're awfully simple because, all I can do now, is decide whether to execute some piece of code or another.
它们之所以太简单的原因是：,现在我能做的，就是,决定执行一块代码或者执行另外一块。
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Having now used this pseudo code to line things up, I can start putting some additional structure on this.
用伪代码把这些事情串起来后,我可以开始进行,一些结构方面的优化了。
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But there's a key line of code that I lost over a moment ago and that was this one here.
但是我刚才漏了一行关键的代码,就是这里的这一行。
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What is that? It's the piece of code we wrote for computing square roots, square roots of actually perfect squares.
对吧？这是什么呢？,这是我们写的计算平方根的代码，计算完全全平方根的。
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It could be, preconditions I want to have on input It could be, explanations of specific things you're doing.
也可以是我对输入的预期是什么,也可以是，对代码,正在进行的特定操作的解释。
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All right. The fourth thing I'm going to do, is I'm going to then construct the block of code.
好，我要做的第四件事情就是，我会去写这块循环代码。
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Because I might have written some code in which I'm expecting that integer particular variable to have an integer value.
因为我可能写了一些代码,来把一些,变量的类型，指定为。
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But if I did have two lines of code or more, I would in fact need to put those back.
但是如果我的确有两行或更多的代码，我其实应该把花括号加上。
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You've got to do it above this chunk of code, you've got to do it inside this chunk of code.
你不得不在一大段代码之上来实现它，你不得不在一大段代码之内来实现它。
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And so at the end of the day, a hundred lines later, it should get to one hundred percent.
所以，最终，100行代码之后，它将100%完成了。
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I've read through the same thing twenty times and I've missed something obvious. Someone who's never seen it before looks at and says, did you really mean to do this?
但是它们有一双旁观者之眼,我把同一段代码读上20遍,都会漏掉一些很明显的错误，从没看过这段代码的人会告诉我？
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In general, good programming style says you put in comments that are going to be valuable in helping you as a reader understand what's going on inside of the code.
通常来说，优秀的编码风格意味着,你要放进去的注释,在帮助代码阅读者,理解代码内部,是怎么工作的。
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But the things we were trying to stress were that it's an important design decision when you are coming up with a piece of code, as to what kind of efficiency your code has.
但是我们这里要强调的是,当你写代码的时候,决定你的代码的效率的很重要的事情，就是你的设计决定。
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I'm gonna zoom in a little more and notice it's pretty much 1, 2, 3, 4, 5, 6, 7, 8, 9 lines of code and that's kind of rounding up because of the white space.
我现在放大一点，大家会看到，2，3，4，5，6，7，8，9行代码，多亏了空格,这些代码才能看起来如此美观。
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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。
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