title: Why the erf functions have no range error?
body: <p>The <code>erfcf(FLT_MAX)</code> produces <code>0.0f</code> and sets <code>errno</code> to <code>ERANGE</code>.</p>
  <p>The <code>erff(FLT_MAX)</code> produces <code>1.0f</code> and does not set <code>errno</code> to <code>ERANGE</code>.</p>
  <p>In both cases returned results differ from the &quot;true results&quot; (i.e. obtained with infinite precision).</p>
  <p>Why <code>ERANGE</code> is set only for <code>erfcf</code>?</p>