From: Emanuel Berg <embe8573@student.uu.se>
To: zsh-workers@zsh.org
Subject: Re: why do ceil/floor give the decimal dot?
Date: Thu, 14 May 2015 05:29:41 +0200 [thread overview]
Message-ID: <87d223et0a.fsf@debian.uxu> (raw)
In-Reply-To: <150513195617.ZM29493@torch.brasslantern.com>
Bart Schaefer <schaefer@brasslantern.com> writes:
> 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.
Take a look at this [1] zsh:
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."
[1] http://user.it.uu.se/~embe8573/conf/.zsh/web
--
underground experts united
http://user.it.uu.se/~embe8573
next prev parent reply other threads:[~2015-05-14 3:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-14 0:32 Emanuel Berg
2015-05-14 2:56 ` Bart Schaefer
2015-05-14 3:29 ` Emanuel Berg [this message]
2015-05-14 3:53 ` Lawrence Velázquez
2015-05-14 9:53 ` Peter Stephenson
2015-05-14 21:38 ` Emanuel Berg
2015-05-14 22:14 ` Lawrence Velázquez
2015-05-14 23:29 ` Emanuel Berg
2015-05-15 0:46 ` Oliver Kiddle
2015-05-15 1:07 ` Emanuel Berg
2015-05-15 1:27 ` Bart Schaefer
2015-05-18 8:16 ` Vincent Lefevre
2015-05-14 4:04 ` Bart Schaefer
2015-05-14 9:12 ` Emanuel Berg
2015-05-14 17:54 ` Bart Schaefer
2015-05-18 8:39 ` Vincent Lefevre
2015-05-18 9:41 ` Mikael Magnusson
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