Java Factorial Using Recursion Example

/*

        Java Factorial Using Recursion Example

        This Java example shows how to generate factorial of a given number

        using recursive function.

 */


import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;


public class JavaFactorialUsingRecursion {


    public static void main(String args[]) throws NumberFormatException,

            IOException {


        System.out.println("Enter the number: ");


        // get input from the user

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(br.readLine());


        // call the recursive function to generate factorial

        int result = fact(a);


        System.out.println("Factorial of the number is: " + result);

    }


    static int fact(int b) {

        if (b <= 1)

            // if the number is 1 then return 1

            return 1;

        else

            // else call the same function with the value - 1

            return b * fact(b - 1);

    }

}


/*

 * Output of this Java example would be

 *

 * Enter the number: 5 Factorial of the number is: 120

 */