/* From: "COMPUTATIONAL PHYSICS, 2nd Ed" 
   by RH Landau, MJ Paez, and CC Bordeianu 
   Copyright Wiley-VCH, 2007.
   Electronic Materials copyright: R Landau, Oregon State Univ, 2007;
   MJ Paez, Univ Antioquia, 2007; and CC Bordeianu, Univ Bucharest, 2007.
   Support by National Science Foundation
*/
// ReadStnd.java: standard (keyboard) input stream 

import java.io.*;                               // Import I/O library

public class ReadStnd { 
  public static final double PI = Math.PI;               // Constants
	
  public static void main(String[] argv) throws IOException  { 
		
    double r, A;  
		BufferedReader b = new BufferedReader(
		                             new InputStreamReader(System.in));
    System.out.println("Please enter your name");            // Input
		   // Read & print 1st line; read & convert 2nd line to double
    String name = b.readLine();
    System.out.println("Hi "+name+" \n Please enter r");
    String rS = b.readLine();
    r = Double.valueOf(rS).doubleValue();    
    A = PI * r * r;                                // The computation
    System.out.println("\n Bye "+name+"\t R= " +r+", A=" +A);  
  }
}