Floating point literals are described by the following lexical definitions:
floatnumber 
::=  pointfloat  exponentfloat 
pointfloat 
::=  [intpart] fraction  intpart "." 
exponentfloat 
::=  (intpart  pointfloat)
exponent 
intpart 
::=  digit+ 
fraction 
::=  "." digit+ 
exponent 
::=  ("e"  "E") ["+"  ""] digit+ 
Note that the integer and exponent parts of floating point numbers can look like octal integers, but are interpreted using radix 10. For example, "077e010" is legal, and denotes the same number as "77e10". The allowed range of floating point literals is implementationdependent. Some examples of floating point literals:
3.14 10. .001 1e100 3.14e10 0e0
Note that numeric literals do not include a sign; a phrase like
1
is actually an expression composed of the operator

and the literal 1
.
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