add: Recursion Demo

Author: nguyenkhanhquy

04-methods/.idea/uiDesigner.xml

@@ -0,0 +1,18 @@
+public class RecursionDemo {
+    public static void main(String[] args) {
+        int val = 5;
+        int result = factorial(val);
+        System.out.println("Factorial of " + val + " is " + result);
+    }
+
+    // Define the method
+    static int factorial(int num) {
+        // Base case: 0! = 1
+        if (num == 0) {
+            return 1;
+        } else {
+            // Recursive case: num! = num * (num - 1)!
+            return num * factorial(num - 1);
+        }
+    }
+}