What does it do? It has height, it says, I've got two names of things: the request message and the error message.

那它是用来干嘛的呢？,它声明了包含两个对象：,要求输入的信息和输入类型错误信息。

麻省理工公开课 - 计算机科学及编程导论课程节选

> David: At some point in time, I'm going to have to have declared the variable as a float before I can then hand it to printf as the insertion value for that format strength.

>，大卫：在一个特定的时间，我将需要,声明float类型这样的变量,那样我就可以把它打印出来,像是格式化优点的插入值。

哈佛公开课 - 计算机科学课程节选

So there's no mention of int, and yet we've been saying for the past couple of lectures, that anytime you declare a variable, you absolutely have to specify its type.

这里没有提及int，我们在前几个演讲中,一直讨论的东西，任何时候你声明一个变量，你必须指定它的类型。

哈佛公开课 - 计算机科学课程节选

int So whereas before I mentioned int, turns out if you wanna put a string in a variable, you have to say this is a string.

先不管我之前提到的，如果你想把一个字符串赋给某个变量，那你必须事先声明这个变量是string类型的。

哈佛公开课 - 计算机科学课程节选