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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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12
Task/SEDOLs/Common-Lisp/sedols.lisp Normal file
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(defun append-sedol-check-digit (sedol &key (start 0) (end (+ start 6)))
(assert (<= 0 start end (length sedol)))
(assert (= (- end start) 6))
(loop
:with checksum = 0
:for weight :in '(1 3 1 7 3 9)
:for index :upfrom start
:do (incf checksum (* weight (digit-char-p (char sedol index) 36)))
:finally (let* ((posn (- 10 (mod checksum 10)))
(head (subseq sedol start end))
(tail (digit-char posn)))
(return (concatenate 'string head (list tail))))))