"999 is enough for anybody" triple-zero padding (#18)

When I hit 999 exercises, I will finally have reached the ultimate
state of soteriological release and no more exercises will be needed.
The cycle will be complete. All that will be left is perfect quietude,
freedom, and highest happiness.

exercises/008_quiz.zig

@@ -0,0 +1,34 @@
+//
+// Quiz time! Let's see if you can fix this whole program.
+//
+// This is meant to be challenging.
+//
+// Let the compiler tell you what's wrong.
+//
+// Start at the top.
+//
+const std = @import("std");
+
+pub fn main() void {
+    // What is this nonsense? :-)
+    const letters = "YZhifg";
+
+    const x: u8 = 1;
+
+    // This is something you haven't seen before: declaring an array
+    // without putting anything in it. There is no error here:
+    var lang: [3]u8 = undefined;
+
+    // The following lines attempt to put 'Z', 'i', and 'g' into the
+    // 'lang' array we just created.
+    lang[0] = letters[x];
+
+    x = 3;
+    lang[???] = letters[x];
+
+    x = ???;
+    lang[2] = letters[???];
+
+    // We want to "Program in Zig!" of course:
+    std.debug.print("Program in {s}!\n", .{lang});
+}