Calc1980

A scientific RPN* calculator modeled after the HP calculators of yore with full support for Reverse Postfix Notation is here to help you get your job done faster.

Why RPN?
In the years that followed, computer scientists realized that RPN or postfix notation was very efficient for computer math. As a postfix expression is scanned from left to right, operands are simply placed into a last-in, first-out (LIFO) stack and operators may be immediately applied to the operands at the bottom of the stack. By contrast, expressions with parentheses and precedence (infix notation) require that operators be delayed until some later point. Thus, the compilers on on almost all modern computers converted statements to RPN for execution. (In fact, some computer manufacturers designed their computers around postfix notation.)

Ahh! The Calculator has gone nuts!
This is not a regular calculator app, but a RPN calculator which is designed for speed and advanced expressions. RPN calculators are used differently and requires practice.

* http://www.hpmuseum.org/rpn.htm