factorial program in java

/*

Java Factorial Using Recursion Example

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

using recursive function.

*/

import java.io.IOException;

import java.util.Scanner;

public class JavaFactorialUsingRecursion {

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

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

//get input from the user

Scanner scan=new Scanner(System.in);

int a = scan.nextInt();

//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);

}

}

Enter the number:

5

Factorial of the number is: 120