You don't have to declare a special variable for it if you don't care about its actual value.

你并不需要为它声明一个特定的变量,如果你不关心它的实际值。

哈佛公开课 - 计算机科学课程节选

Now because among its contents is the prototype for print F, that is why, very simply, I can call print F without having to declare its prototype myself.

现在因为在它的内容中是printf的原型，这就是为什么我可以不声明printf函数的原型,而可以调用它。

哈佛公开课 - 计算机科学课程节选

- Then you declare a float called f and then assign it -- -- let me scroll up for the folks in front -- that give return value of GetFloat.

然后你声明一个float类型f，再赋值-,让我向上为你们回滚到-,给出了GetFloat的返回值。

哈佛公开课 - 计算机科学课程节选

But notice unlike a for loop, if you want to declare a variable or increment or decrement to variable, you've got to do that yourself.

但请注意不像for循环，如果你想声明一个变量,或者变大或变小一个变量，你需要自己完成。

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