title: Why postfix (rpn) notation is more used than prefix?
body: <p>By use I mean its use in many calculators like HP35-  </p>
  
  <p>My guesses (and confusions) are -  </p>
  
  <ol>
  <li>postfix is actually more memory efficient -( SO post comments <a href="https://stackoverflow.com/questions/7562477/why-do-we-need-prefix-postfix-notation">here</a> ). (confusion - The evaluation algorithm of both are similar with a stack)</li>
  <li>keyboard input type in calculators back then(confusion - this shouldn't have mattered much as it only depends on order of operators given first or last)  </li>
  </ol>
  
  <p>Another way this question can be asked is what advantages postfix notation have over prefix?<br>
  Can anyone enlighten me?</p>