Factorial.java

package homework;


import java.util.Scanner;

public class Factorial {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("input number from 4 to 12");
        int a = sc.nextInt();
        if (a < 4 || a > 12) {
            System.out.println("wrong input number!!!"); }
        else {

            System.out.println(calcFactorial(a));
        }
    }

    public static long calcFactorial(int a)  {
        long fact=1;
        for(int i=1; i<=a; i++) {
            fact=fact*i;
        }
        return fact;
    }
}