diff options
| -rw-r--r-- | exercises/43_pointers5.zig | 3 | ||||
| -rw-r--r-- | exercises/44_quiz5.zig | 45 | ||||
| -rwxr-xr-x | ziglings | 1 |
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; + } +} @@ -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 " __ __ _ " |