Opened 12 years ago
Closed 11 years ago
#1 closed defect (fixed)
prin1 and ~E produce different outputs.
Reported by: | anonymous | Owned by: | rtoy |
---|---|---|---|
Priority: | minor | Milestone: | |
Component: | Core | Version: | 19c |
Keywords: | printing | Cc: |
Description (last modified by rtoy)
(let ((x (random 1d-3))) (values (prin1-to-string x) (format nil "~E" x)))
will produce different significant digits. I think the problem is in ~E which calls lisp::scale-exponent to scale the number between 0.1 and 1. I think we could just call flonum-to-digits which will give us the digits and the exponent. We can massage that into the desired digits and exponent as in scale-exponent, but we won't have the round-off problem.
Maybe.
Change History (4)
comment:1 Changed 12 years ago by rtoy
- Owner changed from somebody to rtoy
- Status changed from new to assigned
comment:2 Changed 12 years ago by rtoy
- Version set to 19c
comment:3 Changed 12 years ago by rtoy
- Description modified (diff)
comment:4 Changed 11 years ago by rtoy
- Resolution set to fixed
- Status changed from assigned to closed
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One particular example is
The right answer is
which is what prin1 returns.
This should now be fixed in CVS.