FactorialCalculator

//<Factorial> Display recursion
//CSIS312 - <Assignment 6-1>
//Citations if necessary>--
package factorialcalculator;

// Fig. 18.3: FactorialCalculator.java
// Recursive factorial method.
public class FactorialCalculator
{
 public static long factorial(long number, int iteration)
   {
     iteration++;
     
     String space = "";
     
     for(int i = 0; i < iteration; i++){
       space += " ";
     }
     
      if (number <= 1){ // test for base case
        System.out.println(space);
         return 1; // base cases: 0! = 1 and 1! = 1
      }
      else{ // recursion step
   System.out.println(space + (number - 1) + " * factorial( " + (number - 2) + " )");
        return number * factorial(number - 1, iteration);
      }
   } 

   // output factorials for values 0-21
   public static void main(String[] args)
   {
       System.out.println("Lisa Tidball - Assignment 6-1");
      // calculate the factorials of 0 through 21
      for (int counter = 0; counter <= 21; counter++)
         System.out.printf("%d! = %d%n", counter, factorial(counter, 0));
   }
} // end class FactorialCalculator

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