# gsrpn 2008-07-25

RPN Calculator

- LICENSE TYPE:
- GPL (GNU General Public License)
- USER RATING:
- DEVELOPED BY:
**Guido Socher**- HOMEPAGE:
- tuxgraphics.org
- CATEGORY:
- ROOT \ Utilities

gsrpn uses postfix notation also known as Reverse Polish Notation (RPN). The calculator is written in Javascript and will run in any modern web browser.

The RPN notation has many advantages over the Algebraic notation in terms of speed and usability. One advantage is that you can calculate even complicated terms without braces.

An example: Suppose you want calculate 5 * (3 + 4)

Press the following keys on the calculator: 5, enter, 3, enter. The 3 and 5 did go into the calculator's memory, the stack. Now you type 4 and press + to add. After this you just press * to multiply.

You can either operate this calculator with mouse clicks or you can use the keyboard. However some web-browsers have keyboard shortcuts which may conflict with the keys used by this calculator. Therefore you need to place the mouse over the bottom display area (X). The keyboard interface was tested with Firefox, Mozilla, MS IE and Opera. It does not work with Netscape 4.

The following keyboard short cuts are defined:

For all other operations just use the mouse and calculator keypad.

The RPN notation has many advantages over the Algebraic notation in terms of speed and usability. One advantage is that you can calculate even complicated terms without braces.

An example: Suppose you want calculate 5 * (3 + 4)

Press the following keys on the calculator: 5, enter, 3, enter. The 3 and 5 did go into the calculator's memory, the stack. Now you type 4 and press + to add. After this you just press * to multiply.

You can either operate this calculator with mouse clicks or you can use the keyboard. However some web-browsers have keyboard shortcuts which may conflict with the keys used by this calculator. Therefore you need to place the mouse over the bottom display area (X). The keyboard interface was tested with Firefox, Mozilla, MS IE and Opera. It does not work with Netscape 4.

The following keyboard short cuts are defined:

*0-9.=numbers, return=enter*

c=+/-, C=clear, s=swap, p=Roll Stack

^=y^x, r=1/x

-=subtract (use c to change the sign)

+=add

*=multiply

/=dividec=+/-, C=clear, s=swap, p=Roll Stack

^=y^x, r=1/x

-=subtract (use c to change the sign)

+=add

*=multiply

/=divide

For all other operations just use the mouse and calculator keypad.

Last updated on October 8th, 2008

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