Recursive factorial method for long type. - Java Object Oriented Design

Java examples for Object Oriented Design:Method Recursive

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Description

Recursive factorial method for long type.

Demo Code

public class Main
{
   // recursive method factorial (assumes its parameter is >= 0
   public static long factorial(long number)
   {//w w w  .  j  a  va2 s.c  o m
      if (number <= 1) // test for base case
         return 1; // base cases: 0! = 1 and 1! = 1
      else // recursion step
         return number * factorial(number - 1);
   } 

   // output factorials for values 0-21
   public static void main(String[] args)
   {
      // calculate the factorials of 0 through 21
      for (int counter = 0; counter <= 21; counter++){
         System.out.printf("%d! = %d%n", counter, factorial(counter));
      }
   }
}

Result


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