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    <p>You've <a href="https://stackoverflow.com/a/2848109/560648">correctly</a> emptied the string buffer with <code>ss.str("")</code>, but you also need to clear the stream's error state with <code>ss.clear()</code>, otherwise no further reads will be attemped after the first extraction, which led to an EOF condition.</p> <p>So:</p> <pre><code>string whatTime(int seconds) { string h,m,s,ans; stringstream ss; ss &lt;&lt; (seconds/3600); seconds -= (3600*(seconds/3600)); ss &gt;&gt; h; ss.str(""); ss.clear(); ss &lt;&lt; (seconds/60); seconds -= (60*(seconds/60)); ss &gt;&gt; m; ss.str(""); ss.clear(); ss &lt;&lt; seconds; ss &gt;&gt; s; return (h + ":" + m + ":" + s ); } </code></pre> <p>However, if this is your full code and you do not need the individual variables for any reason, I'd do this:</p> <pre><code>std::string whatTime(const int seconds_n) { std::stringstream ss; const int hours = seconds_n / 3600; const int minutes = (seconds_n / 60) % 60; const int seconds = seconds_n % 60; ss &lt;&lt; std::setfill('0'); ss &lt;&lt; std::setw(2) &lt;&lt; hours &lt;&lt; ':' &lt;&lt; std::setw(2) &lt;&lt; minutes &lt;&lt; ':' &lt;&lt; std::setw(2) &lt;&lt; seconds; return ss.str(); } </code></pre> <p>It's much simpler. <a href="http://ideone.com/pZ1jX2" rel="nofollow noreferrer">See it working here</a>.</p> <p>In C++11 <a href="https://stackoverflow.com/questions/8065413/stdlexical-cast-is-there-such-a-thing">you can avoid the stream altogether</a> using <code>std::to_string</code>, but that doesn't allow you to zero-pad.</p>
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    1. CO+1 for your simpler method.
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    2. COthanks for suggesting simpler method.
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