The function parse-float parses a float from the substring of string delimited by start and end and returns it as float .
If the substring represents an integer or the exponent marker is E or is omitted, then float will be of type default-format , which defaults to the value of *read-default-float-format* . Otherwise, its type will match the exponent marker as specified by 2.3.2.2 "Syntax of a Float" in the Common Lisp standard.
If the substring does not represent an integer or a float, then an error of type parse-error is signalled.
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