title: Testing for NaN in VBA/VB6
body: <p>Using VBA I am loading an 8-byte floating point number from an array of bytes into a Double. Some numbers will be IEEE 754 NaN (i.e. if you try to print it with Debug.Print you will see 1.#QNAN). My question is, how can I test whether the data contained in the Double is an NaN as opposed to a regular number?</p>
  
  <p>Thanks.</p>