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diff --git a/exercises/035_enums.zig b/exercises/035_enums.zig
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+//
+// Remember that little mathematical virtual machine we made using the
+// "unreachable" statement?  Well, there were two problems with the
+// way we were using op codes:
+//
+//   1. Having to remember op codes by number is no good.
+//   2. We had to use "unreachable" because Zig had no way of knowing
+//      how many valid op codes there were.
+//
+// An "enum" is a Zig construct that lets you give names to numeric
+// values and store them in a set. They look a lot like error sets:
+//
+//     const Fruit = enum{ apple, pear, orange };
+//
+//     const my_fruit = Fruit.apple;
+//
+// Let's use an enum in place of the numbers we were using in the
+// previous version!
+//
+const std = @import("std");
+
+// Please complete the enum!
+const Ops = enum { ??? };
+
+pub fn main() void {
+    const operations = [_]Ops{
+        Ops.inc,
+        Ops.inc,
+        Ops.inc,
+        Ops.pow,
+        Ops.dec,
+        Ops.dec,
+    };
+
+    var current_value: u32 = 0;
+
+    for (operations) |op| {
+        switch (op) {
+            Ops.inc => {
+                current_value += 1;
+            },
+            Ops.dec => {
+                current_value -= 1;
+            },
+            Ops.pow => {
+                current_value *= current_value;
+            },
+            // No "else" needed! Why is that?
+        }
+
+        std.debug.print("{} ", .{current_value});
+    }
+
+    std.debug.print("\n", .{});
+}