title: How can I convert hexadecimal to decimal numbers in calc of Emacs?
body: <p>How can I convert hexadecimal to decimal numbers in Emacs calc?
  For example, if I enter <code>FF</code>, I want it to convert it to <code>255</code>.</p>
  
  <p>UPDATE:  How do I get the reverse operation, turn base 10 to base 16?</p>