On Tue, Feb 10, 2009 at 8:55 PM, Timothy Pratley
<[email protected]> wrote:
>
> In the code I posted the let evaluated rem before checking the
> arguments.
Thanks for doing all the hard work. :-)
How about:
(defn mod42
"Modulus of num and div. Truncates toward negative infinity."
[num div]
(if-not (and (integer? num) (integer? div))
(throw (IllegalArgumentException. "mod requires two integers"))
(let [m (rem num div)]
(if (or (zero? m) (> (* num div) 0))
m
(+ m div)))))
--Chouser
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