A singly linked list can be reversed by recursion rather than iteration, exploiting the fact that a recursive descent to the tail followed by an unwinding phase gives a backward traversal of a structure that offers only forward links. The mechanism places all work after the recursive call: the base case (a node whose next field is null) identifies the original tail and reassigns the head to it, and each returning frame then relinks its successor back to itself and severs its own forward link, maintaining the invariant that the sublist from the original tail through the current node is already reversed when that frame completes. This belongs to the linked-structure area of data structures, and illustrates the general principle that recursion's call stack serves as an implicit stack of node references — reversal must be achieved by rewriting links rather than by relocating data.
A singly linked list can be reversed by recursion rather than iteration, exploiting the fact that a recursive descent to the tail followed by an unwinding phase gives a backward traversal of a struct…