（cin>> ss）在循环中如何表示字符串ss没有更多的输入。 [英] How to signify no more input for string ss in the loop while (cin >> ss)

问题描述

我用cin从输入流中读取单词，就像

  int main（）{
字串; 
 while（cin>> word）{
 //做输入字
} 
 
 //执行一些其他操作
} 
  

代码结构与上面类似。它是可编译的。在执行过程中，我一直在输入类似于

  aa bb cc dd 
  pre> 
 
 
我的问题是如何结束这个输入？换句话说，假设文本文件只是aa bb cc dd。但是我不知道如何让程序知道这个文件结束了。
解决方案
你的代码是正确的。如果您是交互式输入，则需要发送EOF字符，例如CTRL-D。  
 
 
当您在文件中读取时，不需要此EOF字符。这是因为一旦你打到输入流的末尾，没有什么可以cin（因为流已经关闭了），所以while循环就退出了。
 
I used "cin" to read words from input stream, which like
int main( ){
     string word;
     while (cin >> word){
         //do sth on the input word
     }

    // perform some other operations
}
The code structure is something like the above one. It is compilable. During the execution, I keep inputting something like
aa bb cc dd
My question is how to end this input? In other words, suppose the textfile is just "aa bb cc dd". But I do not know how to let the program know that the file ends.
解决方案
Your code is correct. If you were interactively inputting, you would need to send a EOF character, such as CTRL-D. 

This EOF character isn't needed when you are reading in a file. This is because once you hit the end of your input stream, there is nothing left to "cin"(because the stream is now closed), thus the while loop exits.

                        
这篇关于（cin>> ss）在循环中如何表示字符串ss没有更多的输入。的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！