sorry, i wrote too soon. (Math/abs (- Long/MIN_VALUE 1)) java.lang.IllegalArgumentException: No matching method found: abs (NO_SOURCE_FILE:0)
so, maybe this is a good time to start a clojure math library. or at least have some warning when using math libs in clojure. On Nov 2, 10:32 pm, Paul Iannazzo <somethingital...@gmail.com> wrote: > user=> (Math/abs (- Long/MIN_VALUE 1) > > this hung my clojure repl, clojure 1.1 > > ~~ > Paul Joseph Iannazzo. > > On Tue, Nov 2, 2010 at 10:09 PM, ataggart <alex.tagg...@gmail.com> wrote: > > In a two's-complement system, values always have one more negative > > number than positive number. -2147483648 (being the most negative int) > > has no positive equivalent that can be expressed as an int (Math/abs > > overloads on primitive type). > > > Sean's example using 1.3.0-SNAPSHOT works because literal numbers are > > now read in as longs or doubles. This is also why the original (Math/ > > abs (- Integer/MIN_VALUE 1)) gave the desired result as the int was > > converted to a long via the subtraction function. > > > Of course, the same "problem" would arise if one tried to use the most > > negative long: > > > user=> (Math/abs Long/MIN_VALUE) > > -9223372036854775808 > > > The unsurprising behavior might be for a clojure abs function to > > instead throw an ArithmeticException, since 9223372036854775808 cannot > > be expressed as a long. > > > -- > > 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<clojure%2bunsubscr...@googlegroups.com> > > For more options, visit this group at > >http://groups.google.com/group/clojure?hl=en -- 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
