xical analysis is the process of converting a sequence
of characters in a source code file into a sequence of tokens, and syntax
analysis is the validation of these tokens according to the rules of the
programming language. </p>

<img src='../media/refs/rpn.png' width='40' class='nodark' style='float:left;margin-right:15px; margin-top:15px'/>

<p>The <a href='notation.html'>postfix notation</a> is an economic way to express computations
<i>syntactically</i> as it has no precedence rules and the stack-passin