Moved exercises to exercises because exercises

exercises/30_switch.zig

@@ -0,0 +1,55 @@
+//
+// The "switch" statement lets you match the possible values of an
+// expression and perform a different action for each.
+//
+// This switch:
+//
+//     switch (players) {
+//         1 => startOnePlayerGame(),
+//         2 => startTwoPlayerGame(),
+//         else => {
+//             alert();
+//             return GameError.TooManyPlayers;
+//         }
+//     }
+//
+// Is equivalent to this if/else:
+//
+//     if (players == 1) startOnePlayerGame();
+//     else if (players == 2) startTwoPlayerGame();
+//     else {
+//         alert();
+//         return GameError.TooManyPlayers;
+//     }
+//     
+//
+//
+const std = @import("std");
+
+pub fn main() void {
+    const lang_chars = [_]u8{ 26, 9, 7, 42 };
+
+    for (lang_chars) |c| {
+        switch (c) {
+            1  => std.debug.print("A", .{}),
+            2  => std.debug.print("B", .{}),
+            3  => std.debug.print("C", .{}),
+            4  => std.debug.print("D", .{}),
+            5  => std.debug.print("E", .{}),
+            6  => std.debug.print("F", .{}),
+            7  => std.debug.print("G", .{}),
+            8  => std.debug.print("H", .{}),
+            9  => std.debug.print("I", .{}),
+            10 => std.debug.print("J", .{}),
+            // ... we don't need everything in between ...
+            25 => std.debug.print("Y", .{}),
+            26 => std.debug.print("Z", .{}),
+            // Switch statements must be "exhaustive" (there must be a
+            // match for every possible value).  Please add an "else"
+            // to this switch to print a question mark "?" when c is
+            // not one of the existing matches.
+        }
+    }
+
+    std.debug.print("\n", .{});
+}