*read-default-float-format*
∗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.
*∗***read-eval***∗ Variable*
Value Type:
a generalized boolean.
Initial Value:
true.
Description:
If it is true, the #. reader macro has its normal effect. Otherwise, that reader macro signals an error of type reader-error.
See Also:
*print-readably*Notes:
If *read-eval* is false and *print-readably* is true, any method for print-object that would output a reference to the #. reader macro either outputs something different or signals an error of type print-not-readable.
Expanded Reference: *read-default-float-format*
TODO: Please contribute to this page by adding explanations and examples
*read-default-float-format*