®®
A floating point number is written as an optional minus sign (-) followed by a sequence
of one or more digits followed by a decimal point (.) followed by one or more digits,
optionally followed by an exponent. An exponent is written as e (or E) followed by an
optional minus sign followed by one to three digits.
As with integers, the plus sign (+) must not be used to denote a positive floating point
number.
For example: