// Example of program with a   main method and class method nthRoot 

import java.io.*;

class Week2A

{
// define the identifiers with class scope. See page 202, section 6.7

  static BufferedReader keyboard = new
         BufferedReader (new InputStreamReader(System.in)) ;
  static PrintWriter screen = new PrintWriter( System.out, true);

//--------Class methods start here-------------------------------
  
      private static double nthRoot(double x, double n)
      {
//-------------------------------------------------------
// This class method finds the nth root of any real number 
//      ------------
//       i.e this is a 'method'( see page 28) built into the class Week2A
//  It  is the convention to have all the class methods defined before the main method.
	 
// see page 229 . This method is only visible from the class Week2A.
// This is a choice I have made..I could, if I wish, make it visible from
// any class by using 'public'.

     
         double  logofanswer;

// warning: this method is unprotected against x <= 0  ( for notation see Fig 3.2)         
          logofanswer = Math.log(x)/n;

          return Math.exp(logofanswer);
      }
//-------------------------------------------------------
// You could add more class methods here...
//    private static ......etc...
//    {
//             java code
//             java code
//              ditto
//    }
//------------ End of class methods --------------------------

      public static void main (String [] args ) throws IOException

      {
          String name;
      
          screen.print( "Please type in your name ?" ); screen.flush();
 
          name = keyboard.readLine();

          screen.print ("\n\nHello  " + name );
          screen.println(" - This week.. an example of a class method\n\n");
       
          screen.println(" The cube root of 27 =     " + nthRoot(-27,3));
          screen.println(" The cube root of 9*9*9 =  " + nthRoot(9*9*9,3));
          screen.println(" The 3/2  root of 9*9*9 =  " + nthRoot(9*9*9,1.5));
// notice from the output, computers work to a finite accuracy with real numbers

// QUESTION. Does the following line produce the right answer?If not, why not?

//        screen.println(" The 3/2  root of 9*9*9 =  " + nthRoot(9*9*9,3/2));

// the main method ends here so program stops when it reaches this point.      
       }

}