Write a Java program that accepts a positive long integer between 2 to 15, and t

Question

Write a Java program that accepts a positive long integer between 2 to 15, and then using the number, calculate its factorial (n!). Using do-while statement, make sure it only accepts a valid number (between 2 and 15) – if an invalid number is entered, program should display the original instruction again, using while loop. You can submit the source code only - .java file. Hint: all variables should be declared as long. Hint: After do-while loop for input validation, use for-loop to get the factorial *** Sample output Enter a number between 2 and 15: 15 Factorial of 15 is 1307674368000

Explanation / Answer

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
   public static void main (String[] args) throws java.lang.Exception
   {
   System.out.println("Enter a number between 2 and 15 (both inclusive) : ");
   Scanner scanner = new Scanner(System.in);
   Integer number = scanner.nextInt();
   while (number > 15 || number < 2){
   System.out.println("Enter a number between 2 and 15 (both inclusive) : ");
   number = scanner.nextInt();
   }
   long factorial=1;
   for(int i=2;i<=number;i++){
   factorial *= i;
   }
   System.out.println("Factorial of "+number+ " : "+factorial);
   }
}

==========================

output

===========================

Enter a number between 2 and 15 (both inclusive) : 16
Enter a number between 2 and 15 (both inclusive) : 0
Enter a number between 2 and 15 (both inclusive) : 1
Enter a number between 2 and 15 (both inclusive) : 15
Factorial of 15 : 1307674368000

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