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-//
-// "Elephants walking
-// Along the trails
-//
-// Are holding hands
-// By holding tails."
-//
-// from Holding Hands
-// by Lenore M. Link
-//
-const std = @import("std");
-
-const Elephant = struct {
- letter: u8,
- tail: *Elephant = undefined,
- visited: bool = false,
-};
-
-pub fn main() void {
- var elephantA = Elephant{ .letter = 'A' };
- // (Please add Elephant B here!)
- var elephantC = Elephant{ .letter = 'C' };
-
- // Link the elephants so that each tail "points" to the next elephant.
- // They make a circle: A->B->C->A...
- elephantA.tail = &elephantB;
- // (Please link Elephant B's tail to Elephant C here!)
- elephantC.tail = &elephantA;
-
- visitElephants(&elephantA);
-
- std.debug.print("\n", .{});
-}
-
-// This function visits all elephants once, starting with the
-// first elephant and following the tails to the next elephant.
-// If we did not "mark" the elephants as visited (by setting
-// visited=true), then this would loop infinitely!
-fn visitElephants(first_elephant: *Elephant) void {
- var e = first_elephant;
-
- while (!e.visited) {
- std.debug.print("Elephant {u}. ", .{e.letter});
- e.visited = true;
- e = e.tail;
- }
-}