JavaScript RPN Calculator

How many reverse Poles does it take to change a light bulb?

I wrote this program for efficient keyboard entry, not for mousey-clicky-clicky like most JavaScript calculator applications are. If you don't see a blinking cursor in the ENTRY box, just click in that box to continue.

This is not guaranteed to work. I'm only developing for Firefox at this time.

ENTRY ==> 
  TOP ==> 
STACK ==> 
  FORMAT:

Numeric Entry

digits: 0-9 . e
minus sign: _
change sign: ~
ENTER when done

Examples

5       _5   3.2
3.2e6   _3.2e_6

Unary Ops

s   sin
c   cos
t   tan
a   atan
l   ln(x)
p   e^x
v   sqrt(x)
r   1/x

Binary Ops

+ - * / ^ %

Stack Ops

d   dup
X   exchange
x   pop
C   clear

Multi-Character

Type ' then one of these strings then '.

Functions

'sin'  'cos' 'tan'
'atan' 'ln'  'exp'
'sqrt'

Constants

'pi' (3.14159...)
'ee' (2.71828...)

Numeric Format

N   normal
$   money mode
    (see below)
S,E scientific
F   fixed
P   precision

specify integer before S,E,F,P to change precision

Text Alignment

L/R left/right

Miscellaneous

D   restore
    defaults

Money Mode

Anything without a "." or "e" is entered as cents (optional "-" allowed). A "." (or "e") triggers entering dollars.

Examples

6    =>  $0.06
258  =>  $2.58
5500 => $55.00
_33  => -$0.33
6.   =>  $6.00
_6.2 => -$6.20

Think of "." as kind of like "00", but not quite.

Other Stuff

Z/Y - undo/redo
(history not preserved on page refresh)

TODO

  • switch between help, history, constants
  • implement undo