title: C complex number and printf
body: <p>How to print ( with printf ) complex number? For example, if I have this code:</p>
  
  <pre><code>#include &lt;stdio.h&gt;
  #include &lt;complex.h&gt;
  int main(void)
  {
      double complex dc1 = 3 + 2*I;
      double complex dc2 = 4 + 5*I;
      double complex result;
  
      result = dc1 + dc2;
      printf(" ??? \n", result);
  
      return 0;
  }
  </code></pre>
  
  <p>..what conversion specifiers ( or something else ) should I use instead "???"</p>