Inserted ex. 32 unreachable, added quiz4.

1 files changed, 38 insertions, 0 deletions

diff --git a/32_unreachable.zig b/32_unreachable.zig
new file mode 100644
index 0000000..c81efac
--- /dev/null
+++ b/32_unreachable.zig
@@ -0,0 +1,38 @@
+//
+// Zig has an "unreachable" statement. Use it when you want to tell the
+// compiler that a branch of code should never be executed and that the
+// mere act of reaching it is an error.
+//
+//     if (true) {
+//         ...
+//     } else {
+//         unreachable;
+//     }
+//
+// Here we've made a little virtual machine that performs mathematical
+// operations on a single numeric value. It looks great but there's one
+// little problem: the switch statement doesn't cover every possible
+// value of a u8 number!
+//
+// WE know there are only three operations but Zig doesn't. Use the
+// unreachable statement to make the switch complete. Or ELSE. :-)
+// 
+const std = @import("std");
+
+pub fn main() void {
+    const operations = [_]u8{ 1, 1, 1, 3, 2, 2 };
+
+    var current_value: u32 = 0;
+
+    for (operations) |op| {
+        switch (op) {
+            1  => { current_value += 1; },
+            2  => { current_value -= 1; },
+            3  => { current_value *= current_value; },
+        }
+
+        std.debug.print("{} ", .{current_value});
+    }
+
+    std.debug.print("\n", .{});
+}