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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", .{});
-}