25.2.23 /, //, /// [Variable]

Value Type::

a proper list.

Initial Value::

implementation-dependent.

Description::

The variables /, //, and /// are maintained by the Lisp read-eval-print loop to save the values of results that were printed at the end of the loop.

The value of / is a list of the most recent values that were printed, the value of // is the previous value of /, and the value of /// is the previous value of //.

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::

 (floor 22 7) ⇒  3, 1
 (+ (* (car /) 7) (cadr /)) ⇒  22

Affected By::

Lisp read-eval-print loop.

See Also::

- (variable), + (variable), * (variable), Top level loop