Reverse Polish Notation Calculator

Simple Reverse Polish Notation calculator. It works with integer numbers only and the basic operators (+, -, *, /). The division result is the integer part of it.

How it works:

1. Read a input.
2. If it is an integer (operand), push to the stack.
3. If it is an operator, pop the last and second-to-last operands off the stack, do the operation and then push it back to the stack.
4. If it is empty, close the program.

Usage:

1. git clone https://github.com/crespo/reverse-polish-notation.git
2. cd ./reverse-polish-notation
3. python main.py
4. Type a integer number or a basic operator (+ = sum, - = subtraction, * = multiplication, / = division) and ↵ Enter.
5. When you've finished, type ↵ Enter again and the program should stop.

Example: