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. 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 between number 2 and 15: 15 Factorial of 15 is 1307674368000

Explanation / Answer

import java.util.*;

class longFact
{
   public static void main(String args[])
   {
       long i,f=1,n;
       Scanner scan = new Scanner(System.in);

       do
       {
           System.out.print("Enter number [2 - 15] ");
           n=scan.nextLong();
           if(n>=2 && n<=15)
               break;
       }while(true);

       for(i=1;i<=n;i++)
       {
           f=f*i;
       }
       System.out.println("Factorial of "+n+" is "+f);
   }
}

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