Added first quiz

03_assignment.zig

@@ -24,7 +24,7 @@ pub fn main() void {
     // Perhaps you noticed before that the print function takes two
     // parameters. Now it will make more sense: the first parameter
     // is a string. The string may contain placeholders '{}', and the
-    // second parameter is an anonymous struct (data structure)
-    // with values to be printed in place of the placeholders.
+    // second parameter is an "anonymous list literal" (don't worry
+    // about this for now!) with the values to be printed.
     std.debug.print("{} {} {}\n", .{n, pi, negative_eleven});
 }

04_arrays.zig

@@ -1,26 +1,28 @@
 //
-// Let's learn some array basics. Arrays literals are declared with:
+// Let's learn some array basics. Arrays are declared with:
 //
-//   [size]<type>{ values };
+//   const foo [size]<type> = [size]<type>{ values };
 //
 // When Zig can infer the size of the array, you can use '_' for the
-// size like so:
+// size. You can also let Zig infer the type of the value so the
+// declaration is much less verbose.
 //
-//   [_]<type>{ values };
+//   const foo = [_]<type>{ values };
 //
 const std = @import("std");
 
 pub fn main() void {
-    const some_primes = [_]u8{ 2, 3, 5, 7, 11, 13, 17, 19 };
 
-    // Array values are accessed using square bracket '[]' notation.
-    //
-    // (Note that when Zig can infer the type (u8 in this case) of a
-    // value, we don't have to manually specify it.)
-    //
+    const some_primes = [_]u8{ 1, 3, 5, 7, 11, 13, 17, 19 };
+
+    // Individual values can be set with '[]' notation. Let's fix
+    // the first prime (it should be 2!):
+    some_primes[0] = 2;
+
+    // Individual values can also be accessed with '[]' notation.
     const first = some_primes[0];
 
-    // Looks like we need to complete this expression:
+    // Looks like we need to complete this expression (like 'first'):
     const fourth = ???;
 
     // Use '.len' to get the length of the array:

08_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 {}!\n", .{lang});
+}

ziglings

@@ -72,6 +72,7 @@ check_it 04_arrays.zig "Fourth: 7, Length: 8" "There are two things to complete
 check_it 05_arrays2.zig "LEET: 1337, Bits: 100110011001" "Fill in the two arrays."
 check_it 06_strings.zig "d=d ha ha ha Major Tom" "Each '???' needs something filled in."
 check_it 07_strings2.zig "Ziggy" "Please fix the lyrics!"
+check_it 08_quiz.zig "Program in Zig" "See if you can fix the program!"
 
 echo
 echo "    __   __          _ "