2.4.1 Decimal Literals
for an integer literal shall not have a minus sign.
Ramification: Although this rule is in
this subclause, it applies also to the next subclause.
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.
Ramification: Although these rules are
in this subclause, they apply also to the next subclause.
Examples of decimal
12 0 1E6 123_456 -- integer literals
12.0 0.0 0.456 3.14159_26 -- real literals
Wording Changes from Ada 83
We have changed the syntactic category name
to be numeral
We got this idea from ACID. It avoids the confusion between this and
integers. (Other places don't offer similar confusions. For example,
is different from a string.)