Factorial a Number in Java with Error Handling Message

 A simple factorial a number in Java with Error Handling Message.

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Program Listing

/* Factorial.java

 * Mr. Jake Rodriguez Pomperada,MAED-IT, MIT

 * www.jakerpomperada.com www.jakerpomperada.blogspot.com

 * jakerpomperada@gmail.com

 * Bacolod City, Negros Occidental Philippines

 */

import java.util.Scanner;

public class Factorial {

    public static int factorial (int n){

        int result = 1;

        if (n==0)

            return 1;

        else

            for (int i=1; i<=n; i++) {

                result*=i;

            }

            return result;

    }

    

   

    public static void main(String[] args){

      

        Scanner input = new Scanner(System.in);

        boolean valid;

        

        

        System.out.println();

        do {

        System.out.println();

        System.out.print("\tFactorial Program in Java with Error Handling\n\n");

        System.out.print("\tGive a Number : ");

           int number = input.nextInt();

            valid = (number >= 0   && number <= 16);

            System.out.println();

                

            

            if (!valid) {

            System.out.println("\tNegative Values are Invalid Inputs. Try Again.");

              } 

                   

            else {

              System.out.println("\tThe factorial of " + number +

                  " is " + factorial(number) + ".");

                 

              break;

              }

                

       

        }while (!valid);

        System.out.println();

       System.out.println("\tEnd of Program");

       input.close();

       

      }

}