Floating-point Numbers

A HiLog floating-point number consists of a sequence of digits with an embedded decimal point, optionally preceded by a minus sign ( '-'), and optionally followed by an exponent consisting of uppercase or lowercase 'E' and a signed base $10$ integer.

Using these rules, examples of HiLog floating point numbers are:

              1.0    -34.56    817.3E12    -0.0314e26    2.0E-1

Note that in any case there must be at least one digit before, and one digit after, the decimal point.