A string
Bounding index designators for string
One of the atomic type specifiers short-float, single-float, double-float, or long-float.
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.
(parse-float "10") => 10.0f0
(parse-float "10" :default-format 'double-float) => 10.0d0
(parse-float "10d0") => 10.0d0
(parse-float "10.5") => 10.5f0
(parse-float "10.5d0") => 10.5d0
LispWorks User Guide and Reference Manual - 21 Dec 2011