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Qué (quién) es CAR and CDR - definición
CAR and CDR
PROGRAMMING LANGUAGE CONSTRUCT IN LISP
Car (function); Car and cdr; CAR & CDR; Caar
In computer programming, CAR (car) and CDR (cdr) ( or ) are primitive operations on cons cells (or "non-atomic S-expressions") introduced in the Lisp programming language. A cons cell is composed of two pointers; the car operation extracts the first pointer, and the cdr operation extracts the second.
Cdr
WIKIMEDIA DISAMBIGUATION PAGE
Cdr; CDR (disambiguation)
Note: in AM, also use 'CDR'
...Cdr A.C. Moore.
N-TITLE
cdr
WIKIMEDIA DISAMBIGUATION PAGE
Cdr; CDR (disambiguation)
<programming> /ku'dr/ or /kuh'dr/ The LISP operation that
returns the right-hand node of a binary tree structure. In
the typical case where the tree is used to store a list, the
cdr is the tail of the list, i.e. all but the first element.
The instruction format of the IBM 7090 that hosted the
original LISP implementation featured two 15-bit fields called
the "address" and "decrement" parts. The term "cdr" was
originally "Contents of Decrement part of Register".
Similarly, "car" stood for "Contents of Address part of
Register".
[Jargon File ]
(2007-02-28)
