RPN

• An arithmetic expression is a form of numbers and operators which represent a value
  • There are many ways to write down an arithmetic expression, these include the infix and postfix (Reverse Polish notations)
• Infix notation is what we use every day
  • This is when operators and symbols are mixed together
    • e.g. 5 + 5 * 10 + 2
  • Whilst this method works well for general use, it requires that brackets be used to determine the order of operation. For example (5+5)/2 is different to 5+5/2
    • As brackets add complexity to the calculation, the postfix method (RPN) is used