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(Integer Basics): Document CL style read syntax for

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integers in bases other than 10.
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Eli Zaretskii 2001-09-08 17:42:52 +00:00
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lispref/numbers.texi
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@ -67,6 +67,18 @@ initial sign and optional final period.
-0 ; @r{The integer 0.}
@end example
@cindex integers in specific radix
@cindex radix for reading an integer
@cindex base for reading an integer
In addition, the Lisp reader recognizes a syntax for integers in
bases other than 10: @samp{#B@var{integer}} reads @var{integer} in
binary (radix 2), @samp{#O@var{integer}} reads @var{integer} in octal
(radix 8), @samp{#X@var{integer}} reads @var{integer} in hexadecimal
(radix 16), and @samp{#@var{radix}r@var{integer}} reads @var{integer}
in radix @var{radix} (where @var{radix} is between 2 and 36,
inclusivley). Case is not significant for the letter after @samp{#}
(@samp{B}, @samp{O}, etc.) that denotes the radix.
To understand how various functions work on integers, especially the
bitwise operators (@pxref{Bitwise Operations}), it is often helpful to
view the numbers in their binary form.