Print cardinal or ordinal English numbers by The Conway-Wechsler System in Common Lisp.
The function like a (format nil "~R~ x) but the argument can be a large number.
(cwsystem:radix-string 123)
-> "one hundred twenty-three"
;; minus
(cwsystem:radix-string -4)
-> "minus four"
;; ordinal number
(cwsystem:radix-string 20 nil)
-> "twentieth"
;; large number
(cwsystem:radix-string (ash 1 200))
-> "one novendecillion six hundred six octodecillion nine hundred thirty-eight septendecillion forty-four sedecillion two hundred fifty-eight quindecillion nine hundred ninety quattuordecillion two hundred seventy-five tredecillion five hundred forty-one duodecillion nine hundred sixty-two undecillion ninety-two decillion three hundred forty-one nonillion one hundred sixty-two octillion six hundred two septillion five hundred twenty-two sextillion two hundred two quintillion nine hundred ninety-three quadrillion seven hundred eighty-two trillion seven hundred ninety-two billion eight hundred thirty-five million three hundred one thousand three hundred seventy-six"
The function returns a short scale name of large numbers.
(cwsystem:unit-string 0)
-> "thousand"
(cwsystem:unit-string 1)
-> "million"
(cwsystem:unit-string 2)
-> "billion"
(cwsystem:unit-string 789)
-> "novemoctogintaseptingentillion"
;; ordinal
(cwsystem:unit-string 345 nil)
-> "quinquadragintatrecentillionth"
(cwsystem:unit-string 1234567890)
-> "milliquattuortrigintaducentilliseptensexagintaquingentillinonagintaoctingentillion"
The Published Data of Robert Munafo
http://www.mrob.com/pub/index.html
Large Numbers
The Conway-Wechsler System
http://www.mrob.com/pub/math/largenum.html#conway-wechsler