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Lexical ANTLR description for the real (floating point) constants of the C programming language
Such strings are a non-empty sequence of decimal digits with
an optional occurrence of a point (.) somewhere,
and followed by an optional exponent. Either the point or the exponent
must occur. The exponent starts with
e or E, then there is an optional sign (+, -), and
finally a non-empty sequence of decimal digits. Floating point numbers have an
optional suffix to specify the precision: float (f, F), double
(no suffix), or long double (l, L).
Authors: Guillem Godoy
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