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decode-float Numbers Dictionary floatp
Function

float

float number &optional prototype ⇒ float

Arguments and Values

numbera real.
prototypea float.
floata float.

Description

float converts a

real

number to a float.

If a prototype is supplied, a float is returned that is mathematically equal to number but has the same format as prototype.

If prototype is not supplied, then if the number is already a float, it is returned; otherwise, a float is returned that is mathematically equal to number but is a single float.

Examples

 (float 0) ⇒  0.0
 (float 1 .5) ⇒  1.0
 (float 1.0) ⇒  1.0
 (float 1/2) ⇒  0.5
⇒  1.0d0
OR⇒ 1.0
 (eql (float 1.0 1.0d0) 1.0d0) ⇒  true

See Also

coerce

Backlinks

coerce, Constituent Traits, Destructuring, exp, expt, float, floatp, Integrating Types and Classes, Local Variable Initializations, Numbers Dictionary, Numeric Operations, real, Rule of Canonical Representation for Rationals, short-float, single-float, double-float, long-float, subtypep, Symbols in the COMMON-LISP Package, Syntax of a Float, Type Specifiers