Question

Create a Factorial application that prompts the user for a number and then displays its factorial. The factorial of a number is the product of all the positive integers from 1 to the number. For example, 5! = 5*4*3*2*1. ( in Java)

Answer 1

import java.util.Scanner;
public class FactorialLoop {
    public static void main(String args[]) {
        Scanner scanner = new Scanner(System.in);
        int n;
        System.out.print("Enter number: ");
        n = scanner.nextInt();
        int res = factorial(n);
        System.out.println(res);
    }

    private static int factorial(int n) {
        if(n<=0){
            return 1;
        }
        int res = 1;
        for(int i = 2;i<=n;i++){
            res *= i;
        }
        return res;
    }
}