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ANSI Common Lisp  25 Environment 25.2 Dictionary of Environment
| 25.2.22 *, **, *** |
Variable |
- Value Type:
-
an object.
- Initial Value:
-
implementation-dependent.
- Description:
-
The variables *, **, and *** are
maintained by the Lisp read-eval-print loop to save the
values of results that are printed each time through the loop.
The value of * is the most recent primary value that was printed,
the value of ** is the previous value of *, and
the value of *** is the previous value of **.
If several values are produced, * contains the first value only;
* contains nil if zero values are produced.
The values of *, **, and *** are updated immediately
prior to printing the return value of a top-level form by the
Lisp read-eval-print loop. If the evaluation of such a form
is aborted prior to its normal return, the values of *, **, and ***
are not updated.
- Examples:
-
(values 'a1 'a2)  A1, A2
'b B
(values 'c1 'c2 'c3) C1, C2, C3
(list * ** ***) (C1 B A1)
(defun cube-root (x) (expt x 1/3)) CUBE-ROOT
(compile *) CUBE-ROOT
(setq a (cube-root 27.0)) 3.0
(* * 9.0) 27.0
- Affected By:
-
Lisp read-eval-print loop.
- See Also:
-
- (variable),
+ (variable),
/ (variable),
Section 25.1.1 Top level loop
- Notes:
-
* ==(car /)
** ==(car //)
*** ==(car ///)
- Allegro CL Implementation Details:
-
None.
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