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Using as

3.6.2.1 Integers

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 (see section Prefix Operators).