所以如果没有写入，文件结尾(EOF)不会自动返回?

so if there is NOTHING written, End of File, (EOF) is not returned automatically?

不，不是.它应该由用户发送.

No, it's not. It should be sent by the user.

那么是不是只有用户才能通过Ctrl+Z在stdin中调用EOF?

So is it that only the user can invoke EOF in stdin by pressing Ctrl+Z?

是的，您可以使用可以在控制台中输入的特殊组合键为 stdin 设置 EOF 指示器，对于 linux 控制台，即 Ctrl+D 对于 Windows，它是 Ctrl+Z.

Yes, you can set the EOF indicator for stdin with a special key combination you can input in the console, for linux console that is Ctrl+D and for windows it's Ctrl+Z.

如果是这样，那么 EOF 在 stdin 中有哪些用途?我猜它告诉程序继续阅读，直到用户调用文件结尾?是这个吗?

If so then what are some of the uses of EOF in stdin? I guess it tells the program to continue reading until the user user invokes end of file? is this it?

它的使用取决于你是否指示用户显式输入 EOF，例如，我认为 python 控制台会告诉你类似 按 Ctrl+D 或输入 quit() 退出.

The use of it depends on whether you instruct the user to input the EOF explicitly or not, for example, I think python console will tell you something like Press Ctrl+D or type quit() to exit.

而 EOF 不一定是 -1 它是一个宏，您应该始终使用它来测试 EOF 指标.更重要的是 EOF 不是一个字符，它是一个特殊的值，表示 End Of F文件指示器已设置.

And EOF is not necessarily -1 it's a macro and you should always use it to test for the EOF indicator. And more importantly EOF is not a character, it's a special value that indicates that the End Of File indicator is set.

另外，getchar() 等价于 fgetc(stdin).