import java.util.Scanner; public class whileFactorial { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("Please enter the number: "); int num = in.nextInt(); long fact = myFactorial(num); System.out.println(fact); } public static long myFactorial(long num){ if (num == -1){ return 0;// Condition return } int i = 1 ; long fact = 1; while(i <= num ){ fact = fact * i ; i++; } return fact; } }