Added Quiz 5 for pointers. Elephants!!!

3 files changed, 47 insertions, 2 deletions

diff --git a/exercises/43_pointers5.zig b/exercises/43_pointers5.zig
index adfaea1..dc178ec 100644
--- a/exercises/43_pointers5.zig
+++ b/exercises/43_pointers5.zig
@@ -44,7 +44,7 @@ const Class = enum{
 const Character = struct{
     class: Class,
     gold: u32,
-    health: u8,
+    health: u8 = 100, // <--- You can also fields a default value!
     experience: u32,
 };
 
@@ -52,7 +52,6 @@ pub fn main() void {
     var glorp = Character{
         .class      = Class.wizard,
         .gold       = 10,
-        .health     = 100,
         .experience = 20,
     };
 
diff --git a/exercises/44_quiz5.zig b/exercises/44_quiz5.zig
new file mode 100644
index 0000000..6ec0da9
--- /dev/null
+++ b/exercises/44_quiz5.zig
@@ -0,0 +1,45 @@
+//
+//    "Elephants walking
+//     Along the trails
+//
+//     Are holding hands
+//     By holding tails."
+//     
+//     from Holding Hands
+//       by Lenore M. Link
+// 
+const std = @import("std"); // single quotes
+
+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);
+}
+
+// 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;
+    }
+}
diff --git a/ziglings b/ziglings
index 2692657..4774715 100755
--- a/ziglings
+++ b/ziglings
@@ -115,6 +115,7 @@ check_it 40_pointers2.zig "a: 12, b: 12"
 check_it 41_pointers3.zig "foo=6, bar=11"
 check_it 42_pointers4.zig "num: 5, more_nums: 1 1 5 1"
 check_it 43_pointers5.zig "Wizard (G:10 H:100 XP:20)"
+check_it 44_quiz5.zig "Elephant A. Elephant B. Elephant C." "Oh no! We forgot Elephant B!"
 
 echo
 echo "    __   __          _ "