From: Drew Adams <drew.adams@oracle.com>
To: Emanuel Berg <moasenwood@zoho.eu>, help-gnu-emacs@gnu.org
Subject: RE: bike shifting - output decimal in percent
Date: Sun, 19 May 2019 14:26:26 +0000 (UTC) [thread overview]
Message-ID: <0389094e-82aa-42e3-86cb-747c063cf044@default> (raw)
In-Reply-To: <867eamsxq2.fsf@zoho.eu>
> the original program is _much_ better:
>
> ;; test - should be 43% for
> ;; (bike-compute-step 42 24) ; "43%"
>
> ;; (percent-string 0.01) ; "1%"
> ;; (percent-string 0.1) ; "10%"
> ;; (percent-string 1) ; "100%
> ;; (percent-string 2) ; "200%"
>
> ;; (format "%2.2g%%" (* 100.0 0.01)) ; " 1%" (?)
> ;; (format "%2.2g%%" (* 100.0 0.1)) ; "10%"
> ;; (format "%2.2g%%" (* 100.0 1)) ; "1e+02%" (!?)
> ;; (format "%2.2g%%" (* 100.0 2)) ; "2e+02%" (...)
It all depends on what you want and what your expected
input is.
(format "%1.1d%%" (* 100.0 0.01)) ; "1%"
(format "%1.1d%%" (* 100.0 0.1)) ; "10%"
(format "%1.1d%%" (* 100.0 1)) ; "100%"
(format "%1.1d%%" (* 100.0 2)) ; "200%"
(format "%1.1d%%" (round (* 100.0 0.42857142857142855))) ; "43%"
(defun percent-string (decimal)
(format "%2.1d%%" (round (* 100.0 decimal))))
Like I said (regarding CL `format', but the same is true
of Emacs-Lisp `format': it's a language unto itself.
next prev parent reply other threads:[~2019-05-19 14:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-19 1:34 bike shifting - output decimal in percent Emanuel Berg
2019-05-19 3:50 ` Drew Adams
2019-05-19 3:57 ` Drew Adams
2019-05-19 4:09 ` Drew Adams
2019-05-19 7:05 ` Emanuel Berg
2019-05-19 7:35 ` Emanuel Berg
2019-05-19 7:53 ` Tomas Nordin
2019-05-19 8:02 ` Emanuel Berg
2019-05-19 8:15 ` Tomas Nordin
2019-05-19 8:26 ` Emanuel Berg
2019-05-19 14:26 ` Drew Adams [this message]
2019-05-19 14:15 ` Drew Adams
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