format - How to print roman numerals greater than 3,999? -

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i want print several numbers roman numerals but

(format t "~@r~%" 4000)

leads following error in sbcl 1.3.20 , similar 1 using ccl:

number large print in roman numerals: 4,000    [condition of type simple-error]  restarts:  0: [retry] retry slime repl evaluation request.  1: [*abort] return slime's top level.  2: [abort] abort thread (#<thread "new-repl-thread" running {100503d2b3}>)

i did not find information limit in hyperspec , wasn't aware romans had numbers unto 3,999.

is there ready-to-use solution print numbers greater 3,999 roman numerals?

there no consensus among romans on large number representation. cl implementors demurred on resolving controversy, since both approaches used romans ("apostrophus" , "vinculum") unsuitable representation in ascii on tty.

ps. 3.999 can approximated iv ;-)





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