title: Using the function of a specific library
body: <p>I have a problem: I would like to use the function <code>abs</code> of the library <code>complex</code>.</p>
  
  <p>However, I undergo an error warning me the function <code>abs</code> used is <code>#define abs(x)  (x &gt; 0) ? x : -(x)</code>.</p>
  
  <p>Thus, I think the problem comes from my imports. Because of I also include the stdio and stdlib libraries, the compiler may use the function <code>abs</code> defined in one of these libraries.</p>
  
  <p>So my question is: how can I use the function <code>abs</code> of the library <code>complex</code> without removing any import ?</p>
  
  <p>Thanks a lot in advance for your response.</p>