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POHow to read from std::cin until the end of the stream?
 

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  1. POHow to read from std::cin until the end of the stream?
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    <p>My problem is, that I want to read the input from <code>std::cin</code> but don't know how long the input is. Also I have to <code>char</code> and can't use <code>std::string</code>. There are two ways I have to handle: a) The user inputs text and when he hits [ENTER] the program stops reading. b) The user redirects <code>std::cin</code> to a file (like <code>.\a.oput &lt; file</code>) which can hold multiple lines.</p> <p><strong>Edit:</strong> Just noticed that std::cin.eof() is always false also in the case of reading form a file.</p> <p>For a) I could read until \n occures. For b) <strong>Edit: No</strong> (I could read until std::cin.eof() occures.) But when I don't know whether I'm getting an a) or a b) problem, how can I break the reading process?</p> <p>This is what I have for a) ...</p> <pre><code>char buffer = ' '; while(std::cin &gt;&gt; std::noskipws &gt;&gt; buffer &amp;&amp; buffer != '\n') { // do some stuff with buffer } </code></pre> <p>... and b)</p> <pre><code>char buffer = ' '; while(std::cin &gt;&gt; std::noskipws &gt;&gt; buffer) { // do some stuff with buffer } </code></pre> <p>Also I know there is <code>std::cin.tellg()</code> to get the current position in the stream.</p> <p><strong>Edit:</strong> So it seems like in case of the file the input streams gets terminated, in the way that <code>std::cin &gt;&gt; std::noskipws &gt;&gt; buffer</code> gets <code>false</code>. What the code above does for a):</p> <ul> <li>It waits for the user to make an input and press [ENTER]</li> <li>Then it loops through every char entered by the user on the last line.</li> <li>Then it waits again for the user to make an input and press [ENTER]</li> <li>Infinite-waiting-processing-loop</li> </ul> <p>So how do I do it?</p>
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    1. USLukas
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      1. POHow to read from std::cin until the end of the stream?
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    1. COTell us why you can't use `std::string`. Perhaps we can help you with that problem, too.
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      1. POHow to read from std::cin until the end of the stream?
      1. USRobᵩ
    2. COFor non-standard code you can use `kbhit()` in `conio.h`
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      1. POHow to read from std::cin until the end of the stream?
      1. USMooing Duck
    3. CO@Rob It's from an exercies and we don't 'know' `std::string` yet. Neither can we use non-standard code. What I'm asking is not directly required in the exercies, but I'm just curious...
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