Métodos 3

src/Metodos3.java

@@ -1,4 +1,23 @@
-package PACKAGE_NAME;
+import java.util.*;
 
 public class Metodos3 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        boolean detener = false;
+        int num = 0;
+        while(!detener){
+            System.out.println("Introduce un numero: ");
+            num = sc.nextInt();
+            if(num < 0) {
+                System.out.println("Tiene que ser un numero positivo");
+            } else detener = true;
+        }
+        System.out.printf("El factorial de %d es %.2f\n", num, factorial(num));
+        sc.close();
+    }
+    private static double factorial(int n) {
+        double result = 1.00;
+        while(n > 0) result *= (double)n--;
+        return result;
+    }
 }