如何从标准输入读取输入，直到按下空格或制表符？ [英] How do I read input from standard input until a space or a tab is pressed?

问题描述

我需要从标准输入读取输入，直到按下空格或TAB。

最后，我需要将输入保存在

因为一个标签计为 whitespace

em>，你要求从流中提取第一个令牌。这在C ++中很容易，因为令牌提取已经是>> 运算符的默认行为：

  #include< iostream> 
 #include< string> 
 
 int main（）
 {
 std :: string token; 
 
 if（！（std :: cin>> token））{/ * error * / return 1; } 
 
 //现在你在token中有第一个令牌。 
} 
  

（错误只能出现在奥术情况下，例如当输入文件描述符已在程序启动时关闭。）

I need to read input from standard input until a space or a TAB is pressed.

Eventually, I need to hold the input in a std::string object.

解决方案

Since a tab counts as whitespace, you are asking to extract the first token from the stream. This is very easy in C++, as token extraction is already the default behaviour of the >> operator:

#include <iostream>
#include <string>

int main()
{
    std::string token;

    if (!(std::cin >> token)) { /* error */ return 1; }

    // now you have the first token in "token".
}

(The error can only occur in arcane circumstances, e.g. when the input file descriptor is already closed when the program starts.)

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