2D. float (1.0)
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Floats differ only from normal decimal numbers in that they have
a "." to separate their two parts. Either one may be omitted,
not both. Note that floats have a different internal 32bit (IEEE)
representation (see  12A  for more information on floats).
Examples: 3.14159, .1 (=0.1), 1. (=1.0)