import java.util.Scanner;

class CH10ex1
{
  public static void main (String[] args)
  {
   double pi = Math.PI;
    double inData;
    Scanner scan = new Scanner( System.in );

    System.out.println("Enter a Radius:");
    inData = scan.nextDouble();
    System.out.println("");
    System.out.println("You entered:" + inData + ".");
    System.out.println("");
    System.out.println("The area of that radius is:" + (inData*inData*pi) + ".");
  }
}