1 files changed, 38 insertions, 0 deletions
diff --git a/in_class/cse123-inclass9/RecursiveMystery.java b/in_class/cse123-inclass9/RecursiveMystery.java
new file mode 100644
index 0000000..c4f9806
--- /dev/null
+++ b/in_class/cse123-inclass9/RecursiveMystery.java
@@ -0,0 +1,38 @@
+public class RecursiveMystery {
+    public static void main(String[] args) {
+        // mystery1(3);
+        // mystery2(4);
+        mystery3("taco");
+    }
+
+    public static void mystery1(int n) {
+        if (n <= 1) {
+            System.out.print(n);
+        } else {
+            mystery1(n / 2);
+            System.out.print(", " + n);
+        }
+    }
+
+    public static void mystery2(int n) {
+        if (n <= 0) {
+            System.out.print("*");
+        } else if (n % 2 == 0) {
+            System.out.print("(");
+            mystery2(n - 1);
+            System.out.print(")");
+        } else {
+            System.out.print("[");
+            mystery2(n - 1);
+            System.out.print("]");
+        }
+    }
+
+    public static void mystery3(String str) {
+        if (!str.isEmpty()) {
+            System.out.print(str.charAt(0));
+            mystery3(str.substring(1));
+            System.out.print(str.charAt(0));
+        }
+    }
+}