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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Wed, 13 May 2015 19:56:17 -0700
In-Reply-To: <87oalodmns.fsf@debian.uxu>
Comments: In reply to Emanuel Berg <embe8573@student.uu.se>
        "why do ceil/floor give the decimal dot?" (May 14,  2:32am)
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To: Emanuel Berg <embe8573@student.uu.se>, zsh-workers@zsh.org
Subject: Re: why do ceil/floor give the decimal dot?
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On May 14,  2:32am, Emanuel Berg wrote:
} Subject: why do ceil/floor give the decimal dot?
}
} >From #zsh (incal == yours truly):
} 
} <incal> why do ceil/floor give the decimal dot?
}         echo $(( floor(5) )) -> 5. Isn't that the
}         whole "point" that you want an integer? I know
}         I can get it with int but I thought I'd learn
}         if there is a reason
}         
} <danielsh> incal, I suspect that's an oversight.
} <danielsh> incal, it just uses the C floor() function,

It's not an oversight.  The doc says:

Most functions take floating point arguments and return a floating point
value.  However, any necessary conversions from or to integer type will
be performed automatically by the shell.  Apart from atan with a second
argument and the abs, int and float functions, all functions behave as
noted in the manual page for the corresponding C function [...]

So ciel and floor return float precisely and intentionally because the
C functions do so.