A pocket calculator for the adepts (addicts?) of the Reverse Polish Notation... Do you remember? mine was a HP-16c.

If you don't know what RPN is, you might want to take a look at the wikipedia entry for RPN.
And if you don't like RPN, this site is definitely not for you.

But if you want to try or use this calculator, you should be aware of the following:

The display shows a main register at the bottom and one or more stack locations above it. You enter numbers in the main register and push them on the stack using the enter key. The operators act on the value in the main register and the value in the first location of the stack. The main register changes to a lighter color when it is being edited.

Click here to start the calculator:

Now for the keys you can use:

Provided that your browser allows for running RPN by LHG in a separate window, you can resize the window by grabbing its border with your mouse. The window dimensions and the number of decimals are saved in a cookie to be remembered for the next call.

Have fun with RPN by LHG! Any comments, preferably constructive ;-) are welcome: LHG@acm.org

Copyright 2010, Lionel H. Grillet, Zug, Switzerland.