factorial

serie1/Factorial.java

+public class Factorial {
+
+    public static int factorial(int n) {
+        int res = 1;
+
+        for (int i = 1; i <= n; i++) {
+            res *= i;
+        }
+
+        return res;
+    }
+
+    public static void main(String args[]) {
+        System.out.println(factorial(3));
+    }
+}