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package Maths;

import java.util.*; //for importing scanner

public class Factorial {

public static void main(String[] args) { //main method

int n = 1;

Scanner sc= new Scanner(System.in);

System.out.println("Enter Number");

n=sc.nextInt();

System.out.println(n + "! = " + factorial(n));

}

//Factorial = n! = n1 * (n-1) * (n-2)*...1

/**

* Calculate factorial N

*

* @param n the number

* @return the factorial of {@code n}

*/

public static long factorial(int n) {

// Using recursion

try {

if (n == 0) {

return 1; // if n = 0, return factorial of n;

}else {

return n*factorial(n-1); // While N is greater than 0, call the function again, passing n-1 (Principle of factoring);

}

}catch (ArithmeticException e) {

System.out.println("Dont work with less than 0");

}

return n;

}

}