public class Power {
 public static void main(String[] args) {
  System.out.println(power(5.5,5));
 }
 private static double power(double base, int exponent) {
  if (exponent == 0)
   return 1;
  if (exponent == 1)
   return base;
  double result = power(base, exponent >> 1);
  result *= result;
  if ((exponent & 0x1) == 1)
   result *= base;
  return result;
 }
}