Re: why do ceil/floor give the decimal dot?

[Emanuel Berg <embe8573@xxxxxxxxxxxxx>]

Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx> 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

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