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* COMMENT -*- mode: org -*-
#+Date: 2017-01-26
Time-stamp: <2017-01-26>
* an RPN calculator implemented in HTML and client side javascript
It can be used offline on platforms that support web service.
It use a compute and UI model similar to emacs calc-mode.
* UI
--- stack --- Keyboard | --- trail ---
|
[ ] |
|
7 8 9 < |
|
4 5 6 * |
|
1 2 3 - |
|
0 / . + |
|
SWP UNDO RET |
* features
- totally event based
- virtual keyboard
- everything on the top of stack adds a record in trail window
- show error when an event is invalid. not enough element, division by zero etc.
- partial number input is in virtual display, press RET to send number to stack.
- you can duplicate top value on stack using RET
- you can swap top 2 values on stack using SWP
- you can delete top value on stack using ←
- you can undo using UNDO