--- exercises/100_for4.zig	2023-10-03 22:15:22.125574535 +0200
+++ answers/100_for4.zig	2023-10-05 20:04:07.296104707 +0200
@@ -39,7 +39,7 @@
     const hex_nums = [_]u8{ 0xb, 0x2a, 0x77 };
     const dec_nums = [_]u8{ 11, 42, 119 };
 
-    for (hex_nums, ???) |hn, ???| {
+    for (hex_nums, dec_nums) |hn, dn| {
         if (hn != dn) {
             std.debug.print("Uh oh! Found a mismatch: {d} vs {d}\n", .{ hn, dn });
             return;