/**
 * Course title: Introduction to Programming Principles
 * Course number: CSCI 1301-03
 * Instructor: Dr. Y. Daniel Liang
 * Description: Example 2.1, "Computing the Area of a Circle"
 *   This class is for computing the area of a circle given the
 *   radius. The radius is entered from the keyboard at the DOS
 *   prompt.
 * Copyright: Copyright (c) 2000
 * Company: Armstrong Atlantic State University
 * @author John F. Smith
 * @version 1.0, 11/30/2001
 */

public class ComputeArea
{
  /**Main method*/
  public static void main(String[] args)
  {
    double radius;
    double area;

    // Prompt the user to enter radius
    System.out.print("Enter radius: ");
    radius = MyInput.readDouble();

    // Compute area
    area = radius*radius*3.14159;

    // Display results
    System.out.println("The area for the circle of radius " +
      radius + " is " + area);
  }
}

//------------------

// a class for reading various types from the keyboard (System.in) 
class MyInput
{
    public static String readString()
    {
        String string = "";
        java.io.BufferedReader bufferedReader = 
           new java.io.BufferedReader(new java.io.InputStreamReader(System.in));
        try
        {
            string = bufferedReader.readLine();
        }
        catch (java.io.IOException ex)
        {
            throw new RuntimeException(ex);
        }
        return string;
    }

    public static int readInt()
    {
        return Integer.parseInt(readString());
    }

    public static double readDouble()
    {
        return Double.parseDouble(readString());
    }

    // test all the methods of this class
    public static void main(String[] args)
    {
        System.out.println("Testing 'readString()'");
        System.out.print("Input your string : ");
        System.out.println("Your string was '" + readString() + "'");
        System.out.println("\nTesting 'readInt()'");
        System.out.print("Input your int : ");
        System.out.println("Your int was '" + readInt() + "'");
        System.out.println("\nTesting 'readDouble()'");
        System.out.print("Input your double : ");
        System.out.println("Your double was '" + readDouble() + "'");
    }
}