title: Can float (or double) be set to NaN?
body: <p>Note: Similar to <a href="https://stackoverflow.com/questions/3949457/c-can-int-be-nan">Can an integer be NaN in C++?</a></p>
  
  <p>I understand this has little practical purpose, but can a <code>float</code> or <code>double</code> be set to <code>NaN</code>?</p>