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# Reverse Polish Notation language
# **rpn** - **R**everse **P**olish **N**otation language
- __rpn__ is a reverse polish notation mathematical language, which brings powerfull calculation facilities on floating point number with __arbitrary precision__
- **rpn** is a mathematical language, which brings
- powerfull calculation facilities on floating point numbers with __arbitrary precision__, provided by **GNU MPFR** library
- a **math-oriented language** inspired by Hewlett-Packard **R**everse **P**olish **L**isp (**HP28S** user manual is provided as a reference), it includes at least **stack**, **store**, **branch**, **test**, **trig** and **logs** commands
- using that so cool **reverse polish notation**
- The special feature of this language is to make no difference between keywords and functions, even user functions
Quick examples:
- Following objects are managed: floating numbers, symbols, strings, programs, plus language keywords (commands and flow controls)
- easy calculation with **stacked results**
```
rpn> 1 exp 3 *
8.1548454853771357061
rpn> 2 sqrt
2> 8.1548454853771357061
1> 1.4142135623730950488
rpn>
```
- **programs** and **variables**, eg same example as in HP28S Quick Reference:
```
rpn> << rot * swap 2 / chs dup sq rot - sqrt >> 'quadratic_solution' sto
rpn> 1 2 -3 quadratic_solution
2> -1
1> 2
rpn> vars
var 1: name 'quadratic_solution', type program, value << rot * swap 2 / chs dup sq rot - sqrt >>
```
- **local variables**, always from the same reference:
```
rpn> << -> x y << x y + ln >> >> 'P' sto
rpn> 1 2 P
rpn> 1.0986122886681096914
```
- **arbitrary precision** (up to 0x7FFFFFFFFFFFFFFF bits with GNU MPFR !)
```
rpn> 256 prec 200 std
rpn> pi 3 * 4 / cos
-0.70710678118654752440084436210484903928483593768847403658833986899536623923105962592591087473479525356117497671223960240783675485777817360566073272153486395308799122357513534343724299243077135552002446
rpn>
```
- Inspired by Hewlett-Packard RPL language (**HP28S** user manual is provided as a reference), it includes at least STACK, STORE, BRANCH, TEST, TRIG and LOGS commands of HP28S RPL implementation
- Following objects are managed: **floating numbers**, **symbols**, **strings**, **programs**, plus language **keywords** (commands and flow controls)
```
4> 'symbol'
3> "string"
2> 12.3456
1> << -> n << 0 1 n for i i 2 * inv + next >> >>
rpn>
```
- A __GNU-readline__-based interactive editor with autocompletion is provided.
Multiple-precision floating-point computations with correct rounding are ensured by __MPFR library__ under LGPL v3
## Implemented commands
## Keywords
|GENERAL||
|-|-|
|nop | no operation |