title: What does 0 in printf( 0, "%d", num) do?
body: <p>I usually code in C++, but I'm working on a project in C and I came across a printf with the following syntax: </p>
  
  <pre><code>printf( 0, "%d\n", num);
  </code></pre>
  
  <p>I've looked around and can't find an explanation of what the first 0 in the printf does.  Can someone please explain it to me?  Thanks.</p>