Added first quiz

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: