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His first great discovery was made when he recognized a Cepheid variable star.
VOA: special.2009.04.29
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OK. So if we have variables, one of the questions we can ask is, what's the type of the variable.
好，如果我们有了一个变量，我们要问的问题之一就是，这个变量的类型是什么？
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All right? The first one is, that test has to involve-- shouldn't have to, the value of some variable.
好不好？第一件事是，循环开始的测试必须必须-不是一定，一些变量的值。
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Cepheid variable stars are stars whose brightness changes at regular periods.
VOA: special.2009.04.29
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So, and of course, you know, keeping entropy as a fixed variable for a system like that is extremely cumbersome.
所以，对这样的系统要求它们的熵保持恒定,和一个非常笨拙做法。
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Right? I've allocated a variable, it happens to be a pointer; it's still a variable, who know what's in it, right?
对不？我分配了一个变量，它碰巧是一个指针，它还是一个变量，谁知道它里面是什么？
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Change the independent variable, find the change in the function, take the ratio and that's the derivative.
改变自变量,算出函数的变量,计算比值,这就是求导
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This is continuously variable because I can vary voltage continuously.
这是连续改变的,因为我可以逐渐改变电压。
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If you have an experiment and the outcome of the experiment is a number, then a random variable is the number that comes from the experiment.
如果你有一个试验,这个试验的结果是一个数,那么相对应的随机变量,指的就是这个试验结果所对应的那个数
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One of the advantages of this is, that I don't have to worry about explicitly updating my variable. That happens for me automatically.
这样继续下去，这样做的一个优点是,我不用为更新变量来发愁了,程序会自动的为我进行这个操作，这一点很好。
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If it is right, I'm going to print out the information but I'm also going to change that variable to true.
看如果它是对的,它是对的的话,我将会输出结果。
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Takes a start and an end point, just going to bind local variable names start and end to those pieces.
有一个开始和结束点，就是去把局部的变量的名字,和这些点进行绑定。
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s1 I have a variable called s1 and it's char * of type char * so here we go.
我有一个变量,它的类型是。
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So the system will not be described by a single state variable during the path.
因此系统将不能被,路径上的单一状态变量描述。
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- When you say bracket one, you are storing -- you are referring to the variable here, bracket two.
当你指明，你在存储-,涉及到的变量在这里。
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C So here I'm declaring a variable called c, and I'm pretty much translating the formula from the slide using the characters on my keyboard to a floating point value.
这里我声明了一个变量，然后我把那个幻灯片上的公式,用键盘上的字符翻译成了,浮点数值。
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Again, same kind of reasoning says, given some value x, I happened to pick a small one here, what's an easy way to do this? Well, let's just start at one. That's my variable I'm going to change and check.
好，尤其是，让我们到这里来,让我给大家看看第二个例子,让我把这个注释掉，这是我要解决的，第二个问题，假设我想找到一些整数的,所有除数，我想要找出来这个数的所有的除数。
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That there's a lurking variable which is just that people are more likely to be born in June.
人们的研究对象之中有一个隐藏变量,那就是大多数人都是在六月出生的。
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And when you declare a variable, whether as an argument or as literally a local variable, they only live inside of that function.
当你声明一个变量，不论是一个参数,还是一个局部变量，它们只存在函数的内部。
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And that's fine, because inside of curly braces can you redeclare variables with the same name if you intend to quote unquote shadow the previous variable.
那是可以的，因为,在花括号里面，你可以重新定义一个,相同名字的变量,如果你想引用之前的变量。
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And notice, immediately after that name, another variable name inside of that.
明白了吗？,这个名字之后我们看到的是。
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And we won't wait here one hundred seconds for it to finish, but we're using the loop, we're updating a variable, and we're formatting it in a nice way.
我们将不会再这里等待100秒来等它完成,但是我们使用循环，我们更新一个变量，我们把它排成一个漂亮的格式。
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So this plus plus is sort of shorthand notation for incrementation. So just add 1 to this variable's value, so now socks on feet is of course 1 and so next.
那么这个++符号是递增排序的,所以仅仅是对这个变量加一，现在袜子在脚上是一，那么下一个也是这样。
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All that's going to change, is the value the variable or the value of some data structures.
或者一些数据结构的值,提醒大家在这块代码里面。
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So, when you want to figure out the address & of a variable, you say ampersand.
当你想得到一个变量的地址,你可以指明。
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It's how you can initialize a variable to like zero for counting's sake or something like that.
你可以初始化一个变量，像0用来,计数的或者诸如此类的。
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Then the second derivative gives the change in entropy with respect to the variable that we're differentiating, with respect to which is either pressure or volume.
二阶导数给出熵,随着变量变化的情况，这些变量包括压强或者体积。
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And that test is usually a value of a variable.
测试通常是针对变量的值。
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OK. The other piece I want to say about variable names is, once I have that choice of variable name, I can use it, but in fact there are a few things that I can't use in terms of variable names.
关于变量名字我还想说的,另外一点就是，一旦我对变量的名称可以选择，我可以用自己的方式命名，但是,有一些词汇是,不能用来命名变量的。
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I can just whip out a variable, this time it's gonna be dynamically stored there.
我们可以临时分配一个变量，将这个值暂时存放在这个变量中。
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