Ah.  That's pretty funny :)

On Tue, Apr 9, 2013 at 2:48 AM, Jim foo.bar <jimpil1...@gmail.com> wrote:

>  Hey Mark, don't get paranoid :)... this is all Cedric did!
>
> user=> (def .3 0.4)
> #'user/.3
>
> user=> (+ .3 1.7)
> 2.1
>
> Jim
>
>
>
>
> On 09/04/13 10:46, Mark Engelberg wrote:
>
> What version are you running?
>
> As far as I know, .3 isn't even a valid representation for a number --
> you'd have to write it as 0.3.  So I'm not sure where you're running that
> code snippet such that you don't get an immediate error.
>
> On 1.5.1:
>
> => (+ 0.3 1.7)
> 2.0
>
> That said, I think most programmers know that floating point
> representations of numbers are inexact.  That's why, if you care about
> exactness, you should write:
>
> => (+ 0.3M 1.7M)
> 2.0M
>
> On Tue, Apr 9, 2013 at 1:53 AM, Cedric Greevey <cgree...@gmail.com> wrote:
>
>>   This may look mildly surprising, and suggests one more thing *not* to
>> ever do in production code:
>>
>>  user=> (+ .3 1.7)
>> 2.1
>>  user=>
>>
>> :)
>>
>>  Shouldn't be hard to figure out how to put a repl in a state where that
>> expression will evaluate to that result. I'm sure mathematicians everywhere
>> are deeply offended by the clojure reader now. :)
>>
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