How to find factorial and show result of counting in console?

Question

public class Car {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        System.out.println(n+"!="+factorial(n));
    }
    public static int factorial(int num) {
        return (num == 0) ? 1 : num * factorial (num - 1);
    }
}

how make this code to text in console 3! = 1*2*3 = 6?

Answer 1

Don't use recursion for this. Besides, it isn't really efficient or necessary.

      Scanner in = new Scanner(System.in);
      int n = in.nextInt();
      int fact = 1;
      String s = n + "! = 1";
      for (int i = 2; i <= n; i++) {
         fact *= i;
         s += "*" + i;
      }
      s += " = ";
      System.out.println(s + fact);