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30647, 30649: allow underscores in numeric constants

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Peter Stephenson 2012-09-11 16:02:41 +00:00
parent d88365d964
commit e550c98d69
6 changed files with 112 additions and 19 deletions
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10
Doc/Zsh/arith.yo
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@ -48,6 +48,12 @@ The var(base)tt(#) may also be omitted, in which case
base 10 is used. For backwards compatibility the form
`tt([)var(base)tt(])var(n)' is also accepted.
An integer expression or a base given in the form
`var(base)tt(#)var(n)' may contain underscores (`tt(_)') after the
leading digit for visual guidance; these are ignored in computation.
Examples are tt(1_000_000) or tt(0xffff_ffff) which are equivalent to
tt(1000000) and tt(0xffffffff) respectively.
It is also possible to specify a base to be used for output in the form
`tt([#)var(base)tt(])', for example `tt([#16])'. This is used when
outputting arithmetical substitutions or when assigning to scalar
@ -87,7 +93,9 @@ output is valid syntax for input. If the tt(#) is doubled, for example
Floating point constants are recognized by the presence of a decimal point
or an exponent. The decimal point may be the first character of the
constant, but the exponent character tt(e) or tt(E) may not, as it will be
taken for a parameter name.
taken for a parameter name. All numeric parts (before and after the
decimal point and in the exponent) may contain underscores after the
leading digit for visual guidance; these are ignored in computation.
cindex(arithmetic operators)
cindex(operators, arithmetic)