Numeric Symbols

NumericLiteral = [ "+" | "-" ] Digit { Digit }.

Numeric symbols represent signed integers, which may be arbitrarily large. For example:

    123   +121   -123   -123456789012345678901234567890

Non-negative integers can be written as

    0xZZZ...ZZ

where ZZZ...ZZ is a non-empty sequence of hexadecimal digits.