💾 Archived View for perplexing.space › 2020 › one-thousand-numerals.gmi captured on 2024-02-05 at 09:36:07. Gemini links have been rewritten to link to archived content
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2020-11-12
I think it was Peter Seibel that said `format` and `loop` are among the most devisive points in the Common Lisp community and while I've groused about them myself, I really do like them.
acdw's post¹ (cheat? ;) on 1k a day reminds me of two aspects of the format macro that still make me smile. The first is human readable numbers:
CL-USER> (loop for i from 1 to 10 do (format t "~R " i))
one two three four five six seven eight nine ten
Funnier still though is the option to format as roman numerals. I've tacked it on to the bottom here because I know no one will read beyond that big a block of text, but first! This has reminded me of a book I've been reading, _Arithmetic_, by Paul Lockhart. I think it might appeal to a number of folks in gemini-space, based on the sorts of things people have written about.
It is decidedly *not* a math book and instead covers the human-cultural aspects of number systems and the need to classify things. More than anything it is enjoyable to read a book written by an author who so clearly enjoys the subject matter. Lockhart is a math teacher, perhaps most famous for writing Lockhart's Lament. If you're looking for something to read I can heartily recommend either.
Now, back to Common Lisp:
CL-USER> (loop for i from 1 to 1000 do (format t "~@R " i))
I II III IV V VI VII VIII IX X XI XII XIII XIV XV XVI XVII XVIII XIX XX XXI XXII XXIII XXIV XXV XXVI XXVII XXVIII XXIX XXX XXXI XXXII XXXIII XXXIV XXXV XXXVI XXXVII XXXVIII XXXIX XL XLI XLII XLIII XLIV XLV XLVI XLVII XLVIII XLIX L LI LII LIII LIV LV LVI LVII LVIII LIX LX LXI LXII LXIII LXIV LXV LXVI LXVII LXVIII LXIX LXX LXXI LXXII LXXIII LXXIV LXXV LXXVI LXXVII LXXVIII LXXIX LXXX LXXXI LXXXII LXXXIII LXXXIV LXXXV LXXXVI LXXXVII LXXXVIII LXXXIX XC XCI XCII XCIII XCIV XCV XCVI XCVII XCVIII XCIX C CI CII CIII CIV CV CVI CVII CVIII CIX CX CXI CXII CXIII CXIV CXV CXVI CXVII CXVIII CXIX CXX CXXI CXXII CXXIII CXXIV CXXV CXXVI CXXVII CXXVIII CXXIX CXXX CXXXI CXXXII CXXXIII CXXXIV CXXXV CXXXVI CXXXVII CXXXVIII CXXXIX CXL CXLI CXLII CXLIII CXLIV CXLV CXLVI CXLVII CXLVIII CXLIX CL CLI CLII CLIII CLIV CLV CLVI CLVII CLVIII CLIX CLX CLXI CLXII CLXIII CLXIV CLXV CLXVI CLXVII CLXVIII CLXIX CLXX CLXXI CLXXII CLXXIII CLXXIV CLXXV CLXXVI CLXXVII CLXXVIII CLXXIX CLXXX CLXXXI CLXXXII CLXXXIII CLXXXIV CLXXXV CLXXXVI CLXXXVII CLXXXVIII CLXXXIX CXC CXCI CXCII CXCIII CXCIV CXCV CXCVI CXCVII CXCVIII CXCIX CC CCI CCII CCIII CCIV CCV CCVI CCVII CCVIII CCIX CCX CCXI CCXII CCXIII CCXIV CCXV CCXVI CCXVII CCXVIII CCXIX CCXX CCXXI CCXXII CCXXIII CCXXIV CCXXV CCXXVI CCXXVII CCXXVIII CCXXIX CCXXX CCXXXI CCXXXII CCXXXIII CCXXXIV CCXXXV CCXXXVI CCXXXVII CCXXXVIII CCXXXIX CCXL CCXLI CCXLII CCXLIII CCXLIV CCXLV CCXLVI CCXLVII CCXLVIII CCXLIX CCL CCLI CCLII CCLIII CCLIV CCLV CCLVI CCLVII CCLVIII CCLIX CCLX CCLXI CCLXII CCLXIII CCLXIV CCLXV CCLXVI CCLXVII CCLXVIII CCLXIX CCLXX CCLXXI CCLXXII CCLXXIII CCLXXIV CCLXXV CCLXXVI CCLXXVII CCLXXVIII CCLXXIX CCLXXX CCLXXXI CCLXXXII CCLXXXIII CCLXXXIV CCLXXXV CCLXXXVI CCLXXXVII CCLXXXVIII CCLXXXIX CCXC CCXCI CCXCII CCXCIII CCXCIV CCXCV CCXCVI CCXCVII CCXCVIII CCXCIX CCC CCCI CCCII CCCIII CCCIV CCCV CCCVI CCCVII CCCVIII CCCIX CCCX CCCXI CCCXII CCCXIII CCCXIV CCCXV CCCXVI CCCXVII CCCXVIII CCCXIX CCCXX CCCXXI CCCXXII CCCXXIII CCCXXIV CCCXXV CCCXXVI CCCXXVII 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