--- exercises/099_formatting.zig	2023-10-03 22:15:22.125574535 +0200
+++ answers/099_formatting.zig	2023-10-05 20:04:07.292771311 +0200
@@ -131,7 +131,7 @@
         for (0..size) |b| {
             // What formatting is needed here to make our columns
             // nice and straight?
-            print("{???} ", .{(a + 1) * (b + 1)});
+            print("{d:>3} ", .{(a + 1) * (b + 1)});
         }
 
         // After each row we use double line feed: