Cool, thanks guys :)
Jim
On 25/03/13 15:34, David Powell wrote:
On Mon, Mar 25, 2013 at 3:24 PM, Jim foo.bar <jimpil1...@gmail.com
<mailto:jimpil1...@gmail.com>> wrote:
On 25/03/13 15:22, Ben Wolfson wrote:
The 94th fibonacci number is greater than Long/MAX_VALUE, so it
overflows. It is using longs.
I see....shouldn't Clojure auto-promote it to a BigInt then?
It doesn't by default.
There are two options:
a) artithmetic is polymorphic, and given a bigint argument, will use
bigint arithmetic, so use 0N as suggested.
b) use the auto-promoting arithmentic forms: +' -' *' inc' etc.
Clojure used to do auto-promotion, but it is off by default now as it
has a significant performance impact. In Java, a slot can either be a
primitive or an object, so the auto-promoting forms are forced to box
primitive objects in java.lang.Long wrappers.
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