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POHow to print a bunch of integers with the same formatting?
 

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  1. POHow to print a bunch of integers with the same formatting?
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    <p>I would like to print a bunch of integers on 2 fields with <code>'0'</code> as fill character. I can do it but it leads to code duplication. How should I change the code so that the code duplication can be factored out?</p> <pre class="lang-cpp prettyprint-override"><code>#include &lt;ctime&gt; #include &lt;sstream&gt; #include &lt;iomanip&gt; #include &lt;iostream&gt; using namespace std; string timestamp() { time_t now = time(0); tm t = *localtime(&amp;now); ostringstream ss; t.tm_mday = 9; // cheat a little to test it t.tm_hour = 8; ss &lt;&lt; (t.tm_year+1900) &lt;&lt; setw(2) &lt;&lt; setfill('0') &lt;&lt; (t.tm_mon+1) // Code duplication &lt;&lt; setw(2) &lt;&lt; setfill('0') &lt;&lt; t.tm_mday &lt;&lt; setw(2) &lt;&lt; setfill('0') &lt;&lt; t.tm_hour &lt;&lt; setw(2) &lt;&lt; setfill('0') &lt;&lt; t.tm_min &lt;&lt; setw(2) &lt;&lt; setfill('0') &lt;&lt; t.tm_sec; return ss.str(); } int main() { cout &lt;&lt; timestamp() &lt;&lt; endl; return 0; } </code></pre> <p>I have tried</p> <pre class="lang-cpp prettyprint-override"><code>std::ostream&amp; operator&lt;&lt;(std::ostream&amp; s, int i) { return s &lt;&lt; std::setw(2) &lt;&lt; std::setfill('0') &lt;&lt; i; } </code></pre> <p>but it did not work, the <code>operator&lt;&lt;</code> calls are ambigous.</p> <hr> <p><strong>EDIT</strong> I got 4 awesome answers and I picked the one that is perhaps the simplest and the most generic one (that is, doesn't assume that we are dealing with timestamps). For the actual problem, I will probably use <a href="http://en.cppreference.com/w/cpp/io/manip/put_time" rel="nofollow"><code>std::put_time</code></a> or <a href="http://linux.die.net/man/3/strftime" rel="nofollow"><code>strftime</code></a> though.</p>
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    1. COCreating a new `ostream& operator<<` for `int` is a really bad idea. :)
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    2. CO@LightnessRacesinOrbit Yeah, I figured that out too. Any suggestions what to do instead?
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    3. COif you are trying to format date/time you may want to check this out: http://en.cppreference.com/w/cpp/io/manip/put_time
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