title: quadmath and argument type for scanf
body: <p>I use the <code>&lt;quadmath.h&gt;</code>. With which argument type can I read my input correctly?
  If I use double it looks like:</p>
  
  <pre><code>printf("enter 3 values for s, t and mt:\n");
  scanf("%lf %lf %lf", &amp;s, &amp;t, &amp;mt);
  printf("%lf %lf %lf\n", s, t, mt);
  </code></pre>
  
  <p>I tried different possibilities instead of "l" for example:</p>
  
  <pre><code>scanf("%Qf %Qf %Qf", &amp;s, &amp;t, &amp;mt);
  </code></pre>
  
  <p>or even without     </p>
  
  <pre><code> scanf("%f %f %f", &amp;s, &amp;t, &amp;mt);
  </code></pre>
  
  <p>however I get an error.</p>