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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <150513210405.ZM29616@torch.brasslantern.com>
Date: Wed, 13 May 2015 21:04:05 -0700
In-Reply-To: <87d223et0a.fsf@debian.uxu>
Comments: In reply to Emanuel Berg <embe8573@student.uu.se>
        "Re: why do ceil/floor give the decimal dot?" (May 14,  5:29am)
References: <87oalodmns.fsf@debian.uxu> 
	<150513195617.ZM29493@torch.brasslantern.com> 
	<87d223et0a.fsf@debian.uxu>
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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,  5:29am, Emanuel Berg wrote:
}
}     prefix-len () {
}         local hosts=$1
}         echo $(( 32 - int(ceil(log($hosts)/log(2))) ))
}     }
} 
} without the integer conversion, the output for
} 
}     prefix-len 30
} 
} isn't 27, but "27."

Yes, because as in most languages all integers in a mixed-type expression
are converted to floating point before the operation is carried out, so
$(( 32 - anyfloat )) becomes $(( 32. - anyfloat )) and results in a float.

If what you want to argue is that floating point values that happen to be
whole numbers should not print the trailing dot, that's another discussion.