Saturday, May 15, 2021

Factorial Program in Java with Error Handling

 A simple factorial program with error handling in Java programming language.

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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();
       
      }
}

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