/, //, ///

/, //, /// 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), Section 25.1.1 (Top level loop)

^{lisp-implementation-type, lisp-implementation} version Function

Syntax:

lisp-implementation-type ⟨no arguments⟩ → description

lisp-implementation-version ⟨no arguments⟩ → description

Arguments and Values:

description—a string or nil.

Description:

lisp-implementation-type and lisp-implementation-version identify the current implementation of Common Lisp.

lisp-implementation-type returns a string that identifies the generic name of the particular Common Lisp implementation.

lisp-implementation-version returns a string that identifies the version of the particular Common Lisp implementation.

If no appropriate and relevant result can be produced, nil is returned instead of a string.

Examples:

 
(lisp-implementation-type) 
→ "ACME Lisp" 
<i><sup>or</sup>→</i> "Joe’s Common Lisp" 
(lisp-implementation-version) 
→ "1.3a" 
→ "V2" 
<i><sup>or</sup>→</i> "Release 17.3, ECO #6" 
**short-site-name, long-site-name** *Function* 

Syntax:

short-site-name ⟨no arguments⟩ → description

long-site-name ⟨no arguments⟩ → description

Arguments and Values:

description—a string or nil.

Description:

short-site-name and long-site-name return a string that identifies the physical location of the computer hardware, or nil if no appropriate description can be produced.

Examples:

(short-site-name) 
→ "MIT AI Lab" 
<i><sup>or</sup>→</i> "CMU-CSD" 
(long-site-name) 
→ "MIT Artificial Intelligence Laboratory" 
<i><sup>or</sup>→</i> "CMU Computer Science Department" 

Affected By:

The implementation, the location of the computer hardware, and the installation/configuration process.

Expanded Reference: /, //, ///

tip

TODO: Please contribute to this page by adding explanations and examples

(/, //, /// )