public class RecursionPowerFactorial
{

   public static void main (String [] args )
   {
      int base = 3;
      int exponent = 4;

      System.out.println(base + " to the " + exponent + " power is " + power(base, exponent));

      System .out. println ("The factorial of " + base + " is: " + factorial(base));
   }

   // precondition: 0 <= base
   public static int factorial(int base)
   {
      
      if (base != 0)
      {
         return (base * factorial (base - 1));
      }
      else
      {
         return 1;
      }
      
   }

   // precondition: 0 <= exponent
   public static int power (int base, int exponent)
   {
   
      if (exponent != 0)
      {
         return (base * power(base, exponent - 1));
      }
      else
      {
         return 1;
      }
      
   }
   
}