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- (1)
- A based_literal is a numeric_literal expressed in a form that specifies the base explicitly.

(2) based_literal ::= base # based_numeral [.based_numeral] # [exponent] (3) base ::= numeral (4) based_numeral ::= extended_digit {[underline] extended_digit} (5) extended_digit ::= digit | A | B | C | D | E | F

- (6)
- The base (the numeric value of the decimal numeral preceding the first #) shall be at least two and at most sixteen. The extended_digits A through F represent the digits ten through fifteen, respectively. The value of each extended_digit of a based_literal shall be less than the base.

- (7)
- The conventional meaning of based notation is assumed. An exponent indicates the power of the base by which the value of the based_literal without the exponent is to be multiplied to obtain the value of the based_literal with the exponent. The base and the exponent, if any, are in decimal notation.
- (8)
- The extended_digits A through F can be written either in lower case or in upper case, with the same meaning.

- (9)
*Examples of based literals:*

(10) 2#1111_1111# 16#FF# 016#0ff#-- integer literals of value 25516#E#E1 2#1110_0000#-- integer literals of value 22416#F.FF#E+2 2#1.1111_1111_1110#E11-- real literals of value 4095.0

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