I was bitten by this a year ago and posted here: http://groups.google.com/group/clojure/browse_frm/thread/9091ad790fc96b24
My workaround is to call BigDecimal#stripTrailingZeros before passing it to code that might compare it to some other number. user> (== 1 (.stripTrailingZeros 1.0M)) true However, there is an edge case: user> (== 0 (.stripTrailingZeros 0.0M)) false Which is due to this Java bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6480539 So I use a function like the following instead of bigdec to parse BigDecimals. (defn parse-stripped-bigdec [^String value-str] ;; Note that bigdec uses reflection (at least in Clojure 1.2.1) (let [n (java.math.BigDecimal. value-str)] (if (zero? n) 0M (.stripTrailingZeros n)))) Be aware that stripping the zeros changes how the BigDecimal is formatted by #toString. user> (str (parse-stripped-bigdec "10")) "1E+1" So, I have a special case for BigDecimal that calls #toPlainString in the places where I do not want exponential format. user> (.toPlainString (parse-stripped-bigdec "10")) "10" I hope that helps. - Pat On Oct 4, 8:39 pm, Ben Wolfson <wolf...@gmail.com> wrote: > user> [(== 0 0.0) (== 0.0 0.0M) (== 0.0M 0)] > [true true false] > user> [(== 0 0.0 0.0M) (== 0 0.0M 0.0) (== 0.0 0 0.0M) (== 0.0 0.0M 0) > (== 0.0M 0.0 0) (== 0.0M 0 0.0)] > [true false false false true false] > > -- > Ben Wolfson > "Human kind has used its intelligence to vary the flavour of drinks, > which may be sweet, aromatic, fermented or spirit-based. ... Family > and social life also offer numerous other occasions to consume drinks > for pleasure." [Larousse, "Drink" entry] -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
