Re: (parse-decimal-fraction <string>) --> <rational> ?

In article <47f3b04d$0$90267$14726298@xxxxxxxxxxxxxxx>,
"Alex Mizrahi" <udodenko@xxxxxxxxxxxxxxxxxxxxx> wrote:

??>> (defun parse-decimal-fraction (str)
??>> (let* ((dotpos (position #\. str))
??>> (left (subseq str 0 dotpos))
??>> (right (subseq str (1+ dotpos))))
??>> (+ (parse-integer left)
??>> (/ (parse-integer right)
??>> (expt 10 (length right))))))

LB> (defun parse-decimal-fraction (str &key (start 0) end (radix 10))
LB> (let ((dotpos (position #\. str :start start :end end)))
LB> (+ (parse-integer str :start start :end dotpos :radix radix)
LB> (/ (parse-integer str :start (1+ dotpos) :end end :radix radix)
LB> (expt 10 (- (or end (length str)) (1+ dotpos)))))))

(expt radix .. ), i guess.

Isn't it an oxymoron to have the word "decimal" in the name, but then
make the radix a parameter? Doesn't "decimal" mean "base 10"?

I guess in this context it's just intended to refer to the use of "." as
the separator between the integer and fraction component. Is there a
generic term for this delimiter? "Radix point"?

--
Barry Margolin, barmar@xxxxxxxxxxxx
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***
.

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