Postfix Expressions : A postfix expression evaluator takes as input an arithmetic expression, written in postfix notation, and computes and returns the result. Typically arithmetic is written in infix ...

This document describes the algorithm used to convert a mathematical expression from infix notation (e.g., A + B * C) to postfix notation (Reverse Polish Notation, e.g., A B C * +). The implementation ...

To evaluate a postfix expression, you need a stream of tokens and a stack that holds tokens. To evaluate an expression like 2 3 +, you read in the tokens one at a time, from left to right, and apply ...