Question

Factorial.java

This is an exercise in using repetition structures to calculate the mathematical values of the factorial function. Since methods have not yet been covered in detail, you may do the calculations in a class that contains just a main method. The looping structures require the use of count-controlled loops. This program computes the factorial function of a non-negative integer, which is written mathematically as n! (the parameter n followed by an exclamation mark). For values of n equal to or greater than 1, n! is defined as: n! = n × (n - 1) × (n - 2) × … × 1, and for the value n == 0, is defined as: 0! = 1. The value computed must be a Java integral value (either int or long). The program should ask the user for a value, n ≥ 0. If the value entered is less than zero, a message must be given the user, and the user allowed to try again. If the value is 0, the program should output the value of 0! and exit. If the value is greater than zero, the factorial value of that value n should be printed (if possible). The program must then continue to loop and to ask the user for another number for which the factorial may be computed (after each result has been output), until a zero value is entered. If the user enters a number for which the factorial cannot be computed or cannot be computed correctly, tell the user that is the problem, and keep asking for another number until an acceptable number (or 0) is entered.

Answer 1

Note: Could you plz go this code and let me know if u need any changes in this.Thank You
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// Factorial.java

import java.util.Scanner;

public class Factorial {

   public static void main(String[] args) {
       // Declaring variables
       int n, res;

       /*
       * Creating an Scanner class object which is used to get the inputs
       * entered by the user
       */
       Scanner sc = new Scanner(System.in);

       while (true) {
           // Getting the input entered by the user
           System.out.print("\nEnter a number (Zero to QUIT):");
           n = sc.nextInt();
           if (n == 0) {
               System.out.println("** PROGRAM EXIT **");
               break;
           } else if (n > 1) {
               res = 1;
               for (int i = 1; i <= n; i++) {
                   res *= i;
               }

               // Displaying the output
               System.out.println(n + "! = " + res);

           } else {
               System.out.println("** Invalid.Must be greater than zero **");
           }

       }

   }

}
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Output:

Enter a number (Zero to QUIT):-8
** Invalid.Must be greater than zero **

Enter a number (Zero to QUIT):8
8! = 40320

Enter a number (Zero to QUIT):6
6! = 720

Enter a number (Zero to QUIT):12
12! = 479001600

Enter a number (Zero to QUIT):0
** PROGRAM EXIT **

_____________Thank You