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ANSI Common Lisp  23 Reader 23.2 Dictionary of Reader
| 23.2.14 *read-default-float-format* |
Variable |
- Value Type:
-
one of the atomic type specifiers
short-float,
single-float,
double-float,
or long-float,
or else some other type specifier defined
by the implementation to be acceptable.
- Initial Value:
-
The symbol single-float.
- Description:
-
Controls the floating-point format that is to be used when reading a
floating-point number that has no exponent marker or that has
e or E for an exponent marker. Other exponent markers
explicitly prescribe the floating-point format to be used.
The printer uses *read-default-float-format* to guide the
choice of exponent markers when printing floating-point numbers.
- Examples:
-
(let ((*read-default-float-format* 'double-float))
(read-from-string "(1.0 1.0e0 1.0s0 1.0f0 1.0d0 1.0L0)"))
 (1.0 1.0 1.0 1.0 1.0 1.0) ;Implementation has float format F.
(1.0 1.0 1.0s0 1.0 1.0 1.0) ;Implementation has float formats S and F.
(1.0d0 1.0d0 1.0 1.0 1.0d0 1.0d0) ;Implementation has float formats F and D.
(1.0d0 1.0d0 1.0s0 1.0 1.0d0 1.0d0) ;Implementation has float formats S, F, D.
(1.0d0 1.0d0 1.0 1.0 1.0d0 1.0L0) ;Implementation has float formats F, D, L.
(1.0d0 1.0d0 1.0s0 1.0 1.0d0 1.0L0) ;Implementation has formats S, F, D, L.
- Allegro CL Implementation Details:
-
None.
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