title: convert infix to postfix
body: <p>Im supposed to convert the following to postfix form: 
  <code>(A + B * C) / (D - E * F)</code></p>
  
  <p>I got this for an answer: <code>ABC*+DEF*-/</code></p>
  
  <p>Is this correct? There are a number of questions after that will all be incorrect if I'm using the wrong postfix form. If I am wrong, can you show me why? Thanks for any help.</p>