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- To: Richard Berman <firstname.lastname@example.org>
- Subject: Format
- From: Barry Margolin <barmar@Think.COM>
- Date: Mon, 18 May 87 20:18 EDT
- Cc: email@example.com
- In-reply-to: <8705182246.AA12230@vaxa.isi.edu>
Date: Mon, 18 May 87 15:46:42 PDT
From: Richard Berman <firstname.lastname@example.org>
What should this do:
(FORMAT () "~E" 3/4)
I have one implementation that produces "0.75" and another that produces
"7.5E-1". As far as I can detect, the latter MAY be correct. CLtL says, on
page 393 about the ~E directive, "If all of [the parameters] are omitted, then
the effect is to print the value using ordinary free-format
exponential-notation output; prin1 uses this format for any non-zero number
whose magnitude is less than 10^-3 or greater than or equal to 10^7.
"If arg is a rational number, then it is coerced to be a single-float and
It is unclear whether: (a) the same format used by prin1 for numbers
in the given range should be used regardless of the range of the arg, or (b)
if it should print like prin1.
To me, that sentence strictly says that PRIN1 may contain code like the
(when (and (not (= number 0.0))
(or (< number 1.0e-3)
(>= number 1.0e7)))
(format stream "~E" number))
which I guess corresponds to your (a).
Whether that is what was intended is a different story....
- From: Richard Berman <email@example.com>