float_literal

float_literal 
      ::= 
      ( decimal_digits "." [ decimal_digits ] [ exponent_part ] [ float_type_suffix ] ) 
      | ( "." decimal_digits [ exponent_part ] [ float_type_suffix ] ) 
      | ( decimal_digits [ exponent_part ] [ float_type_suffix ] ) 

This rule is called by

-> literal_expression

Semantic, examples ...

coming soon ...