exercise for new for-loops

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+//
+// The Zig language is in rapid development and continuously improves
+// the language constructs steadily.
+//
+// Since version 0.11, the "for-loops" widely used in other languages
+// such as C, e.g. "for (int i = 0; i < 10..." can now also be formed
+// similarly in Zig, which previously required a "while" construct.
+// Similar in this case actually means better, just as Zig generally
+// tries to make everything simple and "better".
+//
+// These new "for-loops" look like the following in Zig:
+//
+//           for (0..10) |idx| {
+//               // In this case 'idx' takes all values from 0 to 9.
+//           }
+//
+// This is really simple and can replace the previous, somewhat bulky:
+//
+//           var idx: usize = 0;
+//           while (idx < 10) : (idx += 1) {
+//               // Again, idx takes all values from 0 to 9.
+//           }
+//
+// This would also simplify exercise 13, for example.
+// The best way to try this out is to use this exercise, which in the
+// original looks like this:
+//
+//            ...
+//            var n: u32 = 1;
+//
+//            // I want to print every number between 1 and 20 that is NOT
+//            // divisible by 3 or 5.
+//            while (n <= 20) : (n += 1) {
+//                // The '%' symbol is the "modulo" operator and it
+//                // returns the remainder after division.
+//                if (n % 3 == 0) continue;
+//                if (n % 5 == 0) continue;
+//                std.debug.print("{} ", .{n});
+//            }
+//            ...
+//
+const std = @import("std");
+
+// And now with the new "for-loop".
+pub fn main() void {
+
+    // I want to print every number between 1 and 20 that is NOT
+    // divisible by 3 or 5.
+    for (???) |n| {
+
+        // The '%' symbol is the "modulo" operator and it
+        // returns the remainder after division.
+        if (n % 3 == 0) continue;
+        if (n % 5 == 0) continue;
+        std.debug.print("{} ", .{n});
+    }
+
+    std.debug.print("\n", .{});
+}
+
+// Is actually a little easier. The interesting thing here is that the other
+// previous 'while' exercises (11,12, 14) cannot be simplified by this
+// new "for-loop". Therefore it is good to be able to use both variations
+// accordingly.