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Clarify syntax of radixed integers

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* doc/lispref/numbers.texi (Integer Basics): Specify what digits
are allowed in radixed integers, and that there is no initial sign
or final period.
This commit is contained in:
Paul Eggert 2018-03-23 13:49:58 -07:00
parent 582f46cbe2
commit 1f2602cc5d
1 changed files with 9 additions and 6 deletions
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15
doc/lispref/numbers.texi
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@ -75,14 +75,17 @@ Emacs range is treated as a floating-point number.
@cindex hex numbers
@cindex octal numbers
@cindex reading numbers in hex, octal, and binary
The syntax for integers in bases other than 10 uses @samp{#}
followed by a letter that specifies the radix: @samp{b} for binary,
@samp{o} for octal, @samp{x} for hex, or @samp{@var{radix}r} to
specify radix @var{radix}. Case is not significant for the letter
that specifies the radix. Thus, @samp{#b@var{integer}} reads
The syntax for integers in bases other than 10 consists of @samp{#}
followed by a radix indication followed by one or more digits. The
radix indications are @samp{b} for binary, @samp{o} for octal,
@samp{x} for hex, and @samp{@var{radix}r} for radix @var{radix}.
Thus, @samp{#b@var{integer}} reads
@var{integer} in binary, and @samp{#@var{radix}r@var{integer}} reads
@var{integer} in radix @var{radix}. Allowed values of @var{radix} run
from 2 to 36. For example:
from 2 to 36, and allowed digits are the first @var{radix} characters
taken from @samp{0}--@samp{9}, @samp{A}--@samp{Z}.
Letter case is ignored and there is no initial sign or final period.
For example:
@example
#b101100 @result{} 44