2.4.1 Decimal Literals
1
A
decimal_literal
is a
numeric_literal in the conventional decimal
notation (that is, the base is ten).
Syntax
2
decimal_literal ::= numeral [.
numeral] [
exponent]
3
numeral ::= digit {[
underline]
digit}
4
exponent ::= E [+]
numeral | E –
numeral
4.1/2
digit ::= 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
5
An exponent for
an integer literal shall not have a minus sign.
Static Semantics
6
An underline character in a numeric_literal
does not affect its meaning. The letter E of an exponent
can be written either in lower case or in upper case, with the same meaning.
7
An exponent indicates
the power of ten by which the value of the decimal_literal
without the exponent is to be multiplied to
obtain the value of the decimal_literal with
the exponent.
Examples
8
Examples of decimal
literals:
9
12 0 1E6 123_456 -- integer literals
12.0 0.0 0.456 3.14159_26 -- real literals
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