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Print 1.5 as 1.5 and not 15e-1.
We choose the shortest representation
with tie break to the dot notation (0.01 rather than 1e-3).
The printing remains injective, i.e. 12*10^2 is printed 12e2 in order
not to mix it with 1200 and 12/10^1 is not mixed with 120/10^2, the
first being printed as 1.2 and the last as 1.20.
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Four types of numerals are introduced:
- positive natural numbers (may include "_", e.g. to separate thousands, and leading 0)
- integer numbers (may start with a minus sign)
- positive numbers with mantisse and signed exponent
- signed numbers with mantisse and signed exponent
In passing, we clarify that the lexer parses only positive numerals,
but the numeral interpreters may accept signed numerals.
Several improvements and fixes come from Pierre Roux. See
https://github.com/coq/coq/pull/11703 for details. Thanks to him.
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'e' was not displayed when printing decimal notations in R :
Require Import Reals.
Check (1.23e1, 32e+1, 0.1)%R.
was giving
< (123-1%R, 321%R, 1-1%R)
instead of
< (123e-1%R, 32e1%R, 1e-1%R)
This was introduced in #8764 (in Coq 8.10).
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@7693 85f007b7-540e-0410-9357-904b9bb8a0f7
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@2127 85f007b7-540e-0410-9357-904b9bb8a0f7
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