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(as.info)Integers

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Integers
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   A binary integer is `0b' or `0B' followed by zero or more of the
binary digits `01'.

   An octal integer is `0' followed by zero or more of the octal digits
(`01234567').

   A decimal integer starts with a non-zero digit followed by zero or
more digits (`0123456789').

   A hexadecimal integer is `0x' or `0X' followed by one or more
hexadecimal digits chosen from `0123456789abcdefABCDEF'.

   Integers have the usual values.  To denote a negative integer, use
the prefix operator `-' discussed under expressions (Note: Prefix
Operators.).