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  1. (defun clock (hhmm)
  2.   (let ((hh (parse-integer (subseq hhmm 0 2)))
  3.         (mm (parse-integer (subseq hhmm 3 5))))
  4.     (princ
  5.       (substitute #\  #\- (format nil
  6.                                   "It's ~r~:[~:[~; oh~] ~r~;~*~*~] ~:[pm~;am~]~%"
  7.                                   (1+ (mod (1- hh) 12))
  8.                                   (= mm 0)
  9.                                   (< mm 10)
  10.                                   mm
  11.                                   (< hh 12))))))
  12.  
  13. ;; test
  14. (mapc #'clock '("00:00" "01:30" "12:05" "14:01" "20:29" "21:00"))
Success #stdin #stdout 0s 203840KB
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stdin
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Standard input is empty
stdout
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It's twelve am
It's one thirty am
It's twelve oh five pm
It's two oh one pm
It's eight twenty nine pm
It's nine pm
https://ideone.com/XfkSEY
language:
Common Lisp (sbcl 1.4.16)
created:
7 years ago
visibility:
public

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