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Tail-call elimination often reduces asymptotic stack space requirements from linear, or O(n), to constant, or O(1). Tail-call elimination is thus required by the standard definitions of some programming languages, such as Scheme, [5] [6] and languages in the ML family among others.
The significance of tail recursion is that when making a tail-recursive call (or any tail call), the caller's return position need not be saved on the call stack; when the recursive call returns, it will branch directly on the previously saved return position. Therefore, in languages that recognize this property of tail calls, tail recursion ...
The tail is the elongated section at the rear end of a bilaterian animal's body; in general, the term refers to a distinct, flexible appendage extending backwards from the midline of the torso. In vertebrate animals that evolved to lose their tails (e.g. frogs and hominid primates ), the coccyx is the homologous vestigial of the tail.
Every call in CPS is a tail call, and the continuation is explicitly passed. Using CPS without tail call optimization (TCO) will cause not only the constructed continuation to potentially grow during recursion, but also the call stack. This is usually undesirable, but has been used in interesting ways—see the Chicken Scheme compiler. As CPS ...
Note that tail call optimization in general (when the function called is not the same as the original function, as in tail-recursive calls) may be more difficult to implement than the special case of tail-recursive call optimization, and thus efficient implementation of mutual tail recursion may be absent from languages that only optimize tail ...
Carrier Air Wing 15 tail code "NL" is prominently displayed on this A-7E Corsair II. Tail codes on the U.S. Navy aircraft are the markings that help to identify the aircraft's unit and/or base assignment. These codes comprise one or two letters or digits painted on both sides of the vertical stabilizer, on the top right and on the bottom left ...
EW-10000 to EW-99999 (ex-Soviet Union registrations)EW-100AA to EW-999ZZ (aircraft in general, except those listed below) EW-200PA to EW-299PA (reserved for Boeing 737 aircraft)
8 Tail recursion (or tail-end recursion) is particularly useful, and often easy to handle in implementations.