Find Factorial

Aim :

To calculate the factorial of given number.

Important Definition:

Factorial : A number multiplied with all the numbers from 1 to N(for which we want to calculate Factorial).

Representation : !

0! = 1

Factorial only exist for the positive numbers.

For Example:

    n = 5
    factorial(5) = 5 * 4 * 3 * 2 * 1

Code:

package com.BasicsOfJava;

import java.util.Scanner;

public class Factorial {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n ;
        System.out.print("Enter a number : ");
        n = in.nextInt();

        System.out.println(factorial(n));

    }

    static long factorial(int n ){
        if( n == 0) {
            return 1;
        }
        int ans = 1;
        while( n >= 1) {
            ans = ans*n;
            n--;
        }
        return ans;
    }
}

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