C语言中的EOF是什么? [英] What is EOF in the C programming language?

问题描述

你如何看到最后一张照片?换句话说，要为 EOF 输入什么?我检查了定义，它说 EOF 是 -1.

How do you get to see the last print? In other words what to put in for EOF? I checked the definitions and it says EOF is -1.

如果您输入 Ctrl-D，您将看不到任何内容.

And if you enter Ctrl-D you won't see anything.

#include <stdio.h>

int main() {
 int c;
 while((c = getchar() != EOF)) {
  printf("%d
", c);
 }
 printf("%d - at EOF
", c);
}

推荐答案

在 Linux 系统和 OS X 上，输入导致 EOF 的字符是 Ctrl-D.对于 Windows，它是 Ctrl-Z.

On Linux systems and OS X, the character to input to cause an EOF is Ctrl-D. For Windows, it's Ctrl-Z.

取决于操作系统，此字符仅在它是一行的第一个字符时才有效，即 Enter 之后的第一个字符.由于控制台输入通常是面向行的，系统也可能无法识别 EOF 字符，直到您用 Enter 跟进它之后.

Depending on the operating system, this character will only work if it's the first character on a line, i.e. the first character after an Enter. Since console input is often line-oriented, the system may also not recognize the EOF character until after you've followed it up with an Enter.

是的，如果该字符被识别为 EOF，那么您的程序将永远不会看到实际的字符.相反，C 程序将从 getchar() 获得 -1.

And yes, if that character is recognized as an EOF, then your program will never see the actual character. Instead, a C program will get a -1 from getchar().

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